The photoelectric effect consists of the emission of electrons (electric current) that occurs when light falls on a metal surface under certain conditions.
If the light is a stream of photons and each of them has energy, this energy is able to pull an electron out of the crystalline lattice of the metal and communicate, in addition, a kinetic energy.
This is what Einstein proposed:
Light behaves like a stream of particles called photons with an energy
[tex]E=h.f[/tex] (1)
So, the energy [tex]E[/tex] of the incident photon must be equal to the sum of the Work function [tex]\Phi[/tex] of the metal and the kinetic energy [tex]K[/tex] of the photoelectron:
[tex]E=\Phi+K[/tex] (2)
Where [tex]\Phi[/tex] is the minimum amount of energy required to induce the photoemission of electrons from the surface of a metal, and its value depends on the metal.
In the case of Copper [tex]\Phi=4.7eV[/tex]
Now, applying equation (2) in this problem:
[tex]E=4.7eV+1.10eV[/tex] (3)
[tex]E=5.8eV[/tex] (4)
Now, substituting (1) in (4):
[tex]h.f=5.8eV[/tex] (5)
Where:
[tex]h=4.136(10)^{-15}eV.s[/tex] is the Planck constant
[tex]f[/tex] is the frequency
Now, the frequency has an inverse relation with the wavelength [tex]\lambda[/tex]:
[tex]f=\frac{c}{\lambda}[/tex] (6)
Where [tex]c=3(10)^{8}m/s[/tex] is the speed of light in vacuum
Substituting (6) in (5):
[tex]\frac{hc}{\lambda}=5.8eV[/tex] (7)
Then finding [tex]\lambda[/tex]:
[tex]\lambda=\frac{hc}{5.8eV } [/tex] (8)
[tex]\lambda=\frac{(4.136(10)^{-15} eV.s)(3(10)^{8}m/s)}{5.8eV }[/tex]
We finally obtain the wavelength:
[tex]\lambda=213^{-9}m=213nm[/tex]
In this example of the photoelectric effect, the maximum kinetic energy of ejected electrons from a copper surface is given. By using this kinetic energy, Planck's constant, and the work function energy for copper, a calculation can be made to determine the frequency of the incident light. From that frequency, another calculation can determine the corresponding wavelength of the light.
Explanation:This question relates to the photoelectric effect in physics. In essence, the photoelectric effect is a process where electrons are ejected from a material when electromagnetic (EM) radiation is incident on it. The process is explained by the energy of photons, which are quanta of EM radiation, interacting with individual electrons.
A key equation in understanding this interaction is E = hf, where E is the energy of the photons, h is Planck's constant, and f is the frequency of the radiation. Now, the maximum kinetic energy (KEmax) of the ejected electrons is given by, KEmax = hf - BE, where BE represents the binding energy or work function of the electron to the copper surface.
Given that the maximum kinetic energy KEmax is 1.10 eV (electron-volts), and knowing that Planck's constant h is approximately 4.136 x 10^-15 eV/s, we can rearrange the equation to solve for the frequency f -> f = (KEmax + BE) / h. We need the work function or binding energy BE for copper, which is typically around 4.7 eV. Plug all the values into the equation to get the frequency f.
Furthermore, frequency f and wavelength λ are related by the equation c = fλ, where c is the speed of light (~3.0 x 10^8 m/s). Rearranging that equation for λ -> λ = c / f provides the setup to solve for the wavelength of the light used in the photoelectric effect experiment with copper.
Learn more about Photoelectric Effect here:https://brainly.com/question/35875610
#SPJ3
Define gravity in your own words.
Answer:
The word "gravity" refers to the force that pulls an object to another object. More specifically, it is the force that the Earth or another heavenly body exerts on people or objects, pulling them toward it.
Explanation:
hope this helps mark me brainliest
How do you increase capacitance in a capacitor?
If you want to increase the Capacitance of Parallele Plate Capacitor then increase the surface area, reduce the separation between the plate and use a dielectric material in between the plate which have higher dielectric breakdown strength.
1. All of the following would employee ocean engineers EXCEPT?
A. The military
B. Coastal Regions
C. Weather services
D. Scuba gear companies
2. Agriculture is to grain as aquaculture is to
A. Science
B. Seaweed
C. Fish Food
D. Aqueduct
3. How did American captain William Anderson eliminate the problem of ice packs when exploring the arctic?
A. He designed the ship to melt the ice
B. He went under the ice packs with a submarine
C. He developed a particularity narrow ship
D. He went when temperatures were warmer
4. The first echo sounder was used in a German submarine
True or False
5. Supporting all stakeholders means that?
A. Any solution benefits for all stakeholders equally
B. The solution favors human needs over environmental
C. One stakeholder is supported by the expense of the others
D. All needs are taken into account and solutions are designed to consider them all
6. ROVs can play an important role in managing man made disasters in the ocean
True or False
7. One of the biggest challenges in exploring polar regions is
A. Ice packs
B. Hurricanes
C. Polar bears and walruses
D. Lack of latitude and longitude
8. Regardless of the scientific question being asked, scientific research will include all of the following EXCEPT?
A. Use of the scientific method
B. A single approach in every situation
C. Exploration of work by previous scientists
D. Sharing results with the scientific community
9. Chemical oceanographers often study pollution because
A. Most pollution occurs in the ocean
B. Pollution creates chemical changes
C. No other field examines the implications of pollution
D. Only chemical oceanography uses the scientific method
10. Which of the following is a pinniped?
A. Walrus
B. Penguin
C. Arctic fox
D. Polar bear
11. The national oceanic and Atmospheric administration use to buoys to monitor
A. Ship traffic
B. Weather patterns via satellite
C. Movement of tectonic plates
D. Water conditions around coral reefs
12. Most marine science jobs that involve conducting research will require an advanced degree?
True or False
13. Offshore drilling is the concern of
A. Coastal regions
B. Freshwater lakes
C. Inland rivers and streams
D. The deeper parts of the ocean
Your Answers:
1: C. Weather Services
2: B. Seaweed
3: C. He developed a particularity narrow ship (I think.)
4: True The founder/creator of the first echo sounder was German inventor, Alexander Behm.
5: B. The solution favors human needs over environmental. (I think.)
6: True (I think)
7: C. Polar bears and Walruses (I think.)
8: B. A single approach in every situation (I think)
9: A. Most pollution occurs in the ocean
10: A. Walrus Definition of a pinniped: a carnivorous aquatic mammal of the order <i>Pinnipedia</i>, such as a seal or walrus.
11: D. Water conditions around coral reefs (I think)
12: True
13: A. Coastal regions (I think)
Sorry if any of them are incorrect. Some of these I am unsure of how to answer. Hope I helped you,
-Anime.
Answer:
1.C.
2: B.
3: C.
4: ?
5: B.
6: True
7: C.
8: B.
9: A.
10: A..
11: D.
Explanation:
Calculate the number of moles of oxygen in a 12.5-l tank if the pressure is 25325 kpa and the temperature is 22°c
Answer:
= 129.06 moles
Explanation:
Using the ideal gas equation;
PV = nRT
Where; P is the pressure, V is the volumes, n is the number of moles, R is the ideal gas constant and T is the temperature.
In this case; V = 12.5 L, P = 25325 kpa or 249.94 atm, T = 22 + 273 = 295 K and R= 0.08206L atm/mol K
n = PV/RT
= (12.5 × 249.94)/(0.08206 × 295)
= 129.06 moles
PLEASE HELP
A 10.0 kg cart and a 15 kg cart are locked together with a compressed spring between them. They are then released so that the spring pushes the two carts apart. The 15 kg cart is moving at 3.0 m/s afterward. How fast is the 10.0 kg cart moving?
A) 3.0 m/s
B) 4.5 m/s
C) 5.0 m/s
Answer:
4.5 m/s
Explanation:
Initial momentum = final momentum
0 kg m/s = (15 kg) (3.0 m/s) + (10.0 kg) v
v = -4.5 m/s
The negative sign means it's moving in the opposite direction.
Answer:
4.5
Explanation:
4.5
Which of the following statements are true regarding transformers?Check all that apply.
In a transformer, if the primary coil contains more loops than the secondary coil, then it is a step-up transformer.A transformer converts mechanical energy into electrical energy.A transformer is used to increase or decrease a direct current voltage.A transformer is used to increase or decrease an alternating current voltage.In a transformer, if the secondary coil contains more loops than the primary coil, then it is a step-up transformer.In a transformer, the power input is less than the power output.
Answer:
In a transformer, if the secondary coil contains more loops than the primary coil, then it is a step-up transformer.
Explanation:
A transformer is made up of primary coil and secondary coil. when the number of loops in the secondary coil is less than the primary coil, the transformer is called step down transformer. Also if the number of loops in the secondary coil is more than the primary coil, then it is called a step-up transformer. In a step-up transformer the voltage output will be greater.Answer:
There are two correct options.
1. A transformer is used to increase or decrease an alternating current voltage.
2. In a transformer, if the secondary coil contains more loops than the primary coil, then it is a step-up transformer.
Explanation:
A transformer is a device which has two coils. One is primary coil and other is secondary coil.
Input is given to primary coil and output is taken out from secondary coil.
A transformer can increase or decrease the output voltage by setting the number of turns in primary and secondary coil.
If the number of turns in primary coil is less than the number of turns in secondary coil, then it is step up transformer. It increases the output voltage.
The relation between the number of turns and the voltage is given by
[tex]\frac{N_{s}}{N_{p}}=\frac{V_{s}}{V_{p}}=\frac{I_{p}}{I_{s}}[/tex]
Where, Np = number of turns in primary coil
Ns = number of turns in secondary coil
Vp = ac voltage across primary coil
Vs = ac voltage across secondary coil
Ip = ac current across primary coil
Is = ac current across secondary coil
Two charged objects separated by some distance attract each other. If the charges on both objects are doubled with no change in distance between them, what happens to the magnitude of the force between the objects?
a. the force between them quadruples
b. the between them doubles
c. the between them is halved
d. the force between them is quartered
e. the force between them is unchanged
Answer:
a. the force between them quadruples
Explanation:
The electrostatic force between two charges is given by
[tex]F=k\frac{q_1 q_2}{r^2}[/tex]
where
k is the Coulomb's constant
q1 and q2 are the two charges
r is the separation between the two charges
In this problem, the charges on both objects are doubled, so
[tex]q_1' = 2q_1\\q_2' = 2q_2[/tex]
While the distance does not change, so the new force will be
[tex]F'= k \frac{(2q_1)(2q_2)}{r^2}=4 (k\frac{q_1 q_2}{r^2})=4 F[/tex]
so, the force will quadruple.
What would happen to the two balls if one of them were kept positively charged and the charge on the other ball were slowly increased, making it more and more positive?
Two positively charged balls will repel with greater force as the charge on one of them is increased. Grounding the second ball would cause it to lose its charge, making both balls positively charged after the process, with reduced repulsion between them.
Explanation:When one ball is kept positively charged and the charge on the other ball is increased, making it more positive, the two balls will repel each other with greater force. This phenomenon is due to Coulomb's Law, which states that the force between two point charges is directly proportional to the product of their charges and inversely proportional to the square of the distance between them.
If the second ball, which is also positively charged, is momentarily grounded while a negatively charged rod is nearby, it would lose its negative charge to the ground. This is because grounding provides a path for the charge to dissipate into the Earth, effectively neutralizing the charged object. After being ungrounded, if the negatively charged rod is still present, the second ball will have a positive charge due to the removal of its excess electrons. Therefore, both balls would end up with a positive charge, but the magnitude of the charge on the second ball would be reduced by the grounding process, potentially changing the dynamics of their interaction.
The charge on the first ball will remain positive throughout this process, as the presence of the negatively charged rod induces the transfer of electrons from the first ball to the second ball when they are in contact, leaving the first ball positively charged.
Two physics question need quick help
Answer:
2.14 kW, I₂ < I₁
Explanation:
The three resistors are in parallel. The net resistance is:
1/R = 1/R₁ + 1/R₂ + 1/R₃
1/R = 1/20 + 1/8 + 1/500
1/R = 0.177
R = 5.65
The power is:
P = IV
P = (V/R) V
P = V²/R
P = (110)² / 5.65
P = 2140 W
P = 2.14 kW
For two resistors in parallel, the one with the higher resistance has the smaller current. I₂ < I₁.
Describe the direction of the electric force between two opposite charges, between two like charges, and when a charge is in an electric field.
- Two opposite charges:
The electrostatic force between two opposite charges is attractive. This means that if we have a positive charge and a negative charge, the electrostatic force between them is attractive.
- Two like charges:
The electrostatic force between two like charges is repulsive. This means that if we have two positive charges, or two negative charges, the force exerted by one charge on the other one is repulsive.
- A charge in an electric field:
The direction of the electric force on a charge in an electric field depends on the sign of the charge. In fact, we have
[tex]F=qE[/tex]
where F is the electric force, q is the charge, and E the electric field. We have the two following situations:
- If the charge is positive, q > 0, then the electric force has the same direction as the electric field (so the charge will be accelerated in the same direction as the electric field)
- If the charge is negative, q < 0, then the electric force has opposite direction to the electric field (so the charge will be accelerated in the opposite direction to the electric field)
Like charges repel each other and unlike charges attract each other. The direction of the force when a charge is placed in an electric field depends on whether the charge is positive (same direction as the field) or negative (opposite direction as the field).
Explanation:The electric force that exists between two charges can be determined by their nature. If the charges are similar, that is, both are either positive or negative, then the direction of the electric force will be repulsive, and they push each other away. The electric field lines in this case would emanate away from the charges.
On the other hand, if the charges are dissimilar (that is, one positive and one negative), then the direction of the electric force is attractive—they pull towards each other. The electric field lines in this case would point from the positive charge towards the negative one.
When a charge is placed in an electric field, the direction of the force it experiences depends on its nature. If the charge is positive, it will experience a force in the direction of the field. If it's negative, the force will be in the opposite direction to the field.
Learn more about Electric Force here:https://brainly.com/question/21093704
#SPJ6
The amplitude of a system moving in simple harmonic motion is doubled. Determine by what factor the following change.
(a) the total energy
(b) the maximum speed
(c) the maximum acceleration
(d) the period
(a) The total energy increases by a factor 4
The total energy of a simple harmonic system is given by:
[tex]E=\frac{1}{2}kA^2[/tex]
where
k is the spring constant
A is the amplitude of the motion
In this part of the problem, the amplitude is doubled:
A' = 2A
So the new total energy is
[tex]E=\frac{1}{2}k(A')^2=\frac{1}{2}k(2A)^2=4(\frac{1}{2}kA^2)=4E[/tex]
So, the energy quadruples.
(b) The maximum speed increases by a factor 2
The maximum speed in a simple harmonic motion is given by
[tex]v=\omega A[/tex]
where
[tex]\omega=\sqrt{\frac{k}{m}}[/tex] is the angular frequency, with k being the spring constant and m the mass
A is the amplitude
In this part of the problem, k and m do not change, so the angular frequency does not change. Instead, the amplitude is doubled:
A' = 2A
So the new maximum speed is
[tex]v'=\omega (A')=\omega (2A)=2 (\omega A)=2 v[/tex]
so, the maximum speed doubles.
(c) The maximum acceleration increases by a factor 2
The maximum acceleration in a simple harmonic motion is given by
[tex]a=\omega^2 A[/tex]
where
[tex]\omega=\sqrt{\frac{k}{m}}[/tex] is the angular frequency, with k being the spring constant and m the mass
A is the amplitude
In this part of the problem, k and m do not change, so the angular frequency does not change. Instead, the amplitude is doubled:
A' = 2A
So the new maximum acceleration is
[tex]a'=\omega^2 (A')=\omega^2 (2A)=2 (\omega^2 A)=2 a[/tex]
so, the maximum acceleration doubles.
(d) The period does not change
The period in a simple harmonic motion is given by
[tex]T=2\pi \sqrt{\frac{m}{k}}[/tex]
where m is the mass and k is the spring constant.
In this problem, the amplitude is doubled:
A' = 2A
However, we notice that the period does not depend on the amplitude, and since both m and k do not change, then the period will remain constant.
Final answer:
Doubling the amplitude in simple harmonic motion quadruples the total energy, doubles both the maximum speed and maximum acceleration, while the period remains unchanged. If the spring constant is doubled, the mass must be doubled to keep the same frequency.
Explanation:
Impact of Doubling the Amplitude on Simple Harmonic Motion
When the amplitude A of a system undergoing simple harmonic motion (SHM) is doubled, the following changes occur:
(a) Total energy of the system, which includes both kinetic and potential energy, is proportional to the square of the amplitude. Therefore, doubling the amplitude results in quadrupling the total energy (a factor of 4).
(b) Maximum speed (Vmax) of the system in SHM is directly proportional to the amplitude. As a result, doubling the amplitude doubles the maximum speed (a factor of 2).
(c) Maximum acceleration is also directly proportional to the amplitude. By doubling the amplitude, the maximum acceleration is also doubled (a factor of 2).
(d) The period of oscillation (T) is independent of the amplitude and will remain unchanged.
If the spring constant (k) of a simple harmonic oscillator is doubled, the mass (m) of the system needs to be doubled as well, in order to maintain the same frequency of motion, based on the formula for the frequency f = 1/(2π√(m/k)).
In Figure 1, starting from the left, what magnetic poles are shown on the two bar magnets?
The answer is:North South North South.
Hope this helped :)
Answer: North, south, north, south.
Explanation:
In a usual magnetic field diagram, the vectors of the field "come" from the north pole and "enter" in the south pole.
In this case, we can see from where the field comes by the small arrows in the field lines, so in the figure the poles are:
North, South, North, South.
Where in the middle, the south pole of the left magnet is receiving the field that comes from the north pole in the other magnet, and the same for the outer poles.
How do carbon-12 and carbon-13 differ?
Select all that apply.
They have different amounts of neutrons.
They have different amounts of electrons.
They have different mass numbers.
They have different atomic charges.
They have different amount of neutrons
Answer:
They have different amounts of neutrons. They have different mass numbers.
Steve is whirling a rubber cork, tied with a string to his finger, over his head as shown in the figure. The motion of the cork is similar to the motion of a planet in the solar system around the sun. Which force in the solar system is similar to the tension in the string?
The tension in the string corresponds to the gravitational attraction between the Sun and any planet.
Answer:
Gravitational Force.Explanation:
While Steve is whirling a rubber cork, it developes a situation which is similar to the Solar System. In the rubber cork movement, there's "circular" motion which is possible thanks to the string, that is, the string works as "attraction force", allowing the system to maintain its movement.
Now, in the Solar System, the graviational force is like the string, it's the physical magnitude that maintains planets on their movements, attached to the Sun someway.
1. a metal spoon can be classified as which of the following
A)CONDUCTOR
B)ELECTRIC FIELD
C)INSULATOR
D)ELECTRIC CHARGE
2.which of the following describes why lighting rods are put on top of houses
A) INSULATING THE HOUSE
B) CONDUCT THE LIGHTING AWAY FROM THE HOUSE
C) REDUCE THE AMOUNT OF STATIC DISCHARGE
D) REDUCE THE LOUDNESS OF THUNDER
1.) D.electric charge 2.) B. Conduct the lighting away from the house
The first answer is actually A, conductor
Which portion of the electromagnetic spectrum is used in a television? a) infrared waves b) X rays c) radio waves d) gamma waves
Answer:
C
Explanation:
When you watch television it is a form of radiation and radio waves is radiation.
Television uses radio waves, specifically those in the radio frequency (RF) range of the electromagnetic spectrum. Option C is correct.
What is wavelength?Wavelength is a fundamental property of waves, including electromagnetic waves like light and radio waves, as well as other types of waves, such as sound waves or water waves.
Here,
Television uses radio waves, specifically those in the radio frequency (RF) range of the electromagnetic spectrum.
Television signals are transmitted from a broadcasting station to a television set via radio waves that are modulated to carry audio and video information. These radio waves fall in the range of frequencies between 47 MHz and 862 MHz for terrestrial television broadcasts. Cable and satellite television transmissions use higher frequencies in the gigahertz (GHz) range.
Infrared waves are used in remote controls, X-rays are used in medical imaging, and gamma waves are used in cancer treatments and industrial applications. None of these are used in television broadcasting.
Learn more about wavelength here:
https://brainly.com/question/13533093
#SPJ6
Astronomers use the _______ of stars to determine how hot they are and their _______ to estimate how far away they are. A. brightness; size B. temperature; position C. size; temperature D. color; brightness
Answer:
color; brightness
Explanation:
Astronomers use the color of stars to determine how hot they are and their brightness to estimate how far away they are.
Astronomers use the color of stars to determine how hot they are and their brightness to estimate how far away they are.
Who are astronomer?A scientist who concentrates their research on a particular issue or area outside the purview of Earth is called an astronomer in the science of astronomy.
They perform observational (by evaluating the data) or theoretical astronomy when observing astronomical objects including stars, planets, moons, comets, and galaxies.
Planetary science, solar astronomy, the creation or evolution of stars, or the formation of galaxies are a few examples of subjects or domains that astronomers investigate.
Therefore, Astronomers use the color of stars to determine how hot they are and their brightness to estimate how far away they are.
To learn more about astronomers, refer to the link:
https://brainly.com/question/14853303
#SPJ5
Diffraction and interference demonstrate which concept?
A) particle nature of light
B) wave nature of light
C) polarization of light
D) refraction of light
Answer: B) wave nature of light
Low pH means that the hydrogen-ion concetration is ________.
in the middle
equal to the pH number
high
low
Final answer:
Low pH indicates a high hydrogen-ion concentration, showcasing that the environment is acidic.
Explanation:
Low pH means that the hydrogen-ion concentration is high. The pH scale is a logarithmic representation of hydrogen ion concentration, where a low pH number indicates a higher concentration of H+ ions, creating an acidic environment. In contrast, a high pH suggests a lower concentration of hydrogen ions and a basic or alkaline condition. For example, a pH of 3 is ten times more acidic than a pH of 4 due to the logarithmic scale of pH, where each whole number change represents a tenfold change in ion concentration.
State two advantages of a lead-acid accumulator over a leclanche cell
Answer:
They are rechargeable
They have a longer life span
They are reusable
Explanation:
Lead acid accumulators and leclanche cells are types of electrochemical cells.
Leclanche cells are primary cells. Primary cells produce chemical reactions through which the electric current generated is irreversible.
Lead Acid Accumulators are secondary cells in which electric current generated is reversible.
This makes lead acid accumulators reusable, more durable and they have a longer life span.
The two advantages of a lead-acid accumulator over a Leclanché cell are its rechargeability and its higher current output, which makes it suitable for applications such as starting car engines.
Explanation:There are two main advantages of a lead-acid accumulator (also known as a lead-acid battery) over a Leclanché cell.
Rechargeability: One of the key advantages of a lead-acid accumulator is that it is rechargeable. This means that after the battery has been discharged (used), it can be recharged again with an external power source. This is in contrast to a Leclanché cell, which is typically not rechargeable. The ability to recharge a lead-acid battery prolongs its lifespan and makes it more cost-effective over the long term. Higher Current Output: Lead-acid accumulators can produce a high current output, which is necessary for starting automobile engines. Because of this, they are commonly utilized in vehicles. This is an advantage over the Leclanché cell, as it typically does not produce as high a current output.It is important to note that, despite these advantages, lead-acid batteries contain a significant amount of lead and a caustic liquid electrolyte, both of which must be handled and disposed of properly due to their environmental impact.
Learn more about Lead-acid Accumulator here:https://brainly.com/question/12699760
#SPJ3
Your bathroom shower curtain swings toward you in the shower when the water is on full blast. Explain.
The water pushes the shower curtain. Push is a force. The water basically thrusts the shower curtain and the curtain will then not stop immediately as it has a bit of braking distance. Then braking distance differs on the total force the water has on the curtain. Simple way: The curtain moves because the water acts as a push to propel the curtain forwards.
Your shower curtain swings towards you when the water is on full blast due to a principle of physics involving pressure variations in rapidly moving fluids. The high-velocity water and air create lower pressure inside the shower, and with standard atmospheric pressure outside the shower, a net inward force results, causing the curtain to swing in.
Explanation:This phenomenon is explained with the principles of physics and more specifically, fluid dynamics. When you have the shower on full blast, a high-velocity stream of water and air is created, which result in a region of lower pressure inside the shower. On the other side of the curtain, the pressure remains at standard atmospheric pressure. This difference in pressure results in a net force that pushes the curtain inward. This interaction with rapidly moving fluids and pressure is the reason why your shower curtain swings or bulges towards you when the water is at full blast. It is similar to the effect observed when passing a truck on the highway, where your car tends to veer towards it - the high velocity of air between the car and the truck creates a region of lower pressure, and the vehicles are pushed together by greater pressure from the outside.
Learn more about Pressure Variations in Fluids here:https://brainly.com/question/28430329
#SPJ12
The velocity of an object is equal to the distance divided by time. The equation is velocity = distance/time. If you wanted to calculate the TIME required for an object to travel a distance and you knew the velocity, you would A) multiply: velocity X distance. B) subtract: velocity – distance. C) divide: distance ÷ velocity D) add: velocity + distance
Answer: C) divide: distance ÷ velocity
Explanation:
The velocity [tex]V[/tex] equation is distance [tex]d[/tex] divided by time [tex]t[/tex]:
[tex]V=\frac{d}{t}[/tex]
If we isolate [tex]t[/tex] we will have:
[tex]t=\frac{d}{V}[/tex]
Hence, the correct option is C: distance divided by velocity.
What causes the radio pulses of a pulsar?
a. The star vibrates.
b. As the star spins, beams of radio radiation from it sweep through space. If one of these beams points toward the Earth, we observe a pulse.
c. The star undergoes nuclear explosions that generate radio emission.
d. The star's dark orbiting companion periodically eclipses the radio waves emitted by the main star.
e. A black hole near the star absorbs energy from it and re-emits it as radio pulses.
A pulsar (pulsating star) is a neutron star that emits very intense jets of electromagnetic radiation in the range of radio waves, X-rays or gamma rays, at short and periodic intervals due to its intense magnetic field that induces this emission.
This jet is "observable" on Earth, when the magnetic pole of the star "points" to our planet and then stops pointing a thousandth of a second later due to the fast rotation of the star, appearing again when the same pole returns to point towards Earth.
Then, what is observed in the terrestrial sky are pulses of radiation with a very exact period, which are repeated again and again.
The radio pulses of a pulsar are produced due to its spinning action. As the star spins, it emits beams of radio radiation that sweep through space. We observe these as pulses when they point towards Earth.
Explanation:The radio pulses of a pulsar are produced by the spinning of the star. As the star spins, it emits beams of radio radiation that sweep through space. If one of these beams points toward Earth, we observe it as a pulse.
The other options provided are not the reasons behind the radio pulses of a pulsar. These radio pulses are not due to the star vibrating or undergoing nuclear explosions. Similarly, it's not the star's dark orbiting companion periodically eclipsing the radio waves nor a black hole near the star absorbing energy and re-emitting it as radio pulses.
So, the correct answer to this question is option (b): As the star spins, beams of radio radiation from it sweep through space. If one of these beams points toward Earth, we observe a pulse.
Learn more about Pulsars here:https://brainly.com/question/36457730
#SPJ6
geothermal pumps can be used for cooling, but not heating. true or false?
Answer:
False
Explanation:
Geothermal pumps can be used for cooling and heating.
Is it possible for one sound wave to cancel another?
yes it is just like a sonar ping can cancel another ping it works the same way as a normal soundwave
hope this helps you
What is the anode in an alkaline battery?
For instance, in an alkaline battery, the anode is typically made of zinc, and manganese dioxide acts as the cathode. And the electrolyte between and inside those electrodes contains ions. ... These free electrons congregate inside the anode (the bottom, flat part of an alkaline battery)
Hope this helps:)
The anode is usually made of zinc, while the cathode is manganese dioxide. The anode is a negative electrode related with oxidation or electron release.
What is alkaline battery?An alkaline battery is a main battery that gets its power from the reaction of zinc metal and manganese dioxide.
Alkaline batteries provide a better energy density and a longer shelf life than zinc chloride batteries.
The anode is a negative electrode related with oxidation or electron release. The anode is the negative pole during discharge and the positive pole during charge in a rechargeable cell.
Hence, the anode is typically made of zinc, while the cathode is manganese dioxide.
To learn more about the alkaline battery, refer to the link;
https://brainly.com/question/16967731
#SPJ2
Work is only being done when what happens to an object?
A) the object does not move
B) the object disappears without explanation
C) it moves in the same direction as the force
D) The object moves in the opposite direction of the force
Ik it's not A or B
Answer:
C) it moves in the same direction as the force
D) The object moves in the opposite direction of the force
Explanation:
As we know by work energy theorem that when work is done on the system of mass then
[tex]W_{net} = KE_f - KE_i[/tex]
now as per the definition of work done we know that
[tex]W = F.d[/tex]
[tex]W = Fdcos\theta[/tex]
so here we will say that when force is applied in the direction of the displacement of the object then it is always positive work and if work is applied in the opposite direction of the displacement of object then it is always negative work.
So here when force is applied then the point of application must move either in the direction of force or in the opposite direction of the force.
so correct answer will be
C) it moves in the same direction as the force
D) The object moves in the opposite direction of the force
Explain the difference in how current flows through two light bulbs connected in series circuit and in two light bulbs connected in parallel circuit.
Current flow in light bulbs varies between series and parallel circuits; in a series, the current is consistent but the voltage is divided, while in parallel, each bulb receives the full voltage with the total current being split among them.
When two light bulbs are connected in a series circuit, the current flows through the first light bulb and then into the second. This means that the same current flows through both bulbs. However, the voltage across each bulb is divided, which may result in both bulbs being dimmer than if they were connected separately to a voltage source. Thus, in a series circuit with a single battery source, two light bulbs would appear half as bright compared to if they were connected individually to the battery.
In contrast, two light bulbs connected in a parallel circuit have the same voltage applied to them as the source voltage. This is because each bulb is connected directly to the power supply on its own parallel path. Therefore, each light bulb receives the full voltage from the source and they will shine as bright as they would individually. However, the current drawn from the source is divided between the bulbs, with each having its separate current flow. This parallel arrangement will cause the battery to drain more quickly as it is supplying full energy to both bulbs concurrently.
Using the analogy of water flowing through hoses, a series circuit is akin to water traveling through a single hose where the current (amount of water) remains constant, whereas a parallel circuit is like having multiple hoses with the same pressure (voltage) applied, causing more water (current) to flow overall.
hich of the following is NOT true? (1 point)
Hypotheses can be tested.
Theories can be proven.
Theories can be disproven.
Two people can interpret the same facts differently.
Answer:
Theories can be proven.
Explanation:
A theory in physics is formed by a group of hypothesis based on experimentation, it can never be proven. As much as you experience many times and in all agree the results with the theory, you can never be sure that the next time the result will not contradict it. Rather, a theory can be refuted by finding a single observation that disagrees with its predictions.
many metamorphic rocks are found along the southwest border of mexico. what is a likely reason for this ?
The reason why there is an abundance of metamorphic rocks in the southwestern part of Mexico is the intense geologic activity in this area. In this area there is geologic activity triggered by the convergent plate boundary of the North American plate and the Cocos plate. The Cocos plate subducts bellow the North American plate, and that causes the surrounding crust to be exposed to high temperatures and pressures. Those high temperatures and pressure lead to metamorphism of the rocks that are deep into the crust. Also, the land is lifted up because of the subduction zone, so these metamorphic rocks start to emerge on the surface or very close to it because they have been pushed upwards.