Answer:
27/5
Explanation:
In Lyman series, the electron returns to the first state while in Balmer series, it returns to the second state (first excited state).
ΔE = h(f₂-f₁) ; f ⇒ frequency
Hence, smaller the value of ΔE, smaller would be the frequency. Hence, to have minimum frequency for any particular spectral line, we'll have to find the minimum value of ΔE. For that to happen in Lyman series, the electron must jump from n=2 to n=1, and from n=3 to n=2 in Balmer series.
Ratio of minimum frequency of Lyman and Balmer series is equal to ratio of ΔE of Lyman to ΔE of Balmer. Minimum value of |ΔE| for Lyman series would be K(1-1/4)=3K/4 and that for Balmer series would be K(1/4-1/9) = 5K/36. Hence, ratio of minimum frequency of Lyman and Balmer series would be (3K/4)÷(5K/36), i.e. ratio = 27/5.
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difference between G and g
Explanation:
G is the universal constant of gravitation, approximately 6.67×10⁻¹¹ m³/kg/s².
g is the acceleration due to gravity. It's defined by the universal law of gravity as:
g = MG / r²
where M is the mass of the planet and r is the distance from the planet's center to the object.
Near the surface of the Earth, g is approximately 9.8 m/s².
Countries establish internal economic zones in order to
have fewer economic restrictions
Explanation:
Answer:
have fewer economic restriction
Explanation:
just took quiz
1)
Chlorine is the atomic number 17 in the periodic table of elements. What information does the atomic number give you about the element chlorine?
A) An atom of chlorine has 17 protons+.
B) An atom if chlorine has 17 protons+ and electrons-.
C) An atom of chlorine has 17 protons+ and 17 neutrons+.
D) Chlorine atoms have 17 of each of the three subatomic particles, protons, neutrons, and electrons.
2)
Consider the information you have about the element chlorine in question #1. Based on that knowledge, what do you know about the atomic structure of aluminum? All BUT ONE statement is true.
A) Aluminum has 13 neutrons.
B) Aluminum has an atomic number of 13
C) Aluminum has 13 protons+ in the nucleus.
D) The number of protons equals the number of electrons.
Answer:
1) B
2) A, B, and D
Explanation:
1) The atomic number provides the number of protons and electrons, since the number of the two are the same.
2) You DO NOT know whether or not the protons are in the nucleus (they are) based on the atomic number, that's just prior knowledge.
Answer: 1. A) An atom of chlorine has 17 protons.
2. D) The number of protons equals the number of electrons.
Explanation:
1. Atomic number is defined as the number of protons or number of electrons that are present in an atom.
For an electrically neutral atom,
Atomic number = Number of electrons = Number of protons
As atomic number of chlorine is 17, it has 17 protons and 17 electrons. It can any any number of neutrons depending on the isotope.
2.
Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom.
Mass number is defined as the sum of number of protons and neutrons that are present in an atom.
Number of protons of aluminium = 17
Number of electrons of aluminium = 2=8+7 = 17
Mass number = Number of protons + Number of neutrons = 17 +18 = 35
Number of protons of aluminium = Number of electrons of aluminium = 17
Thus atomic number of aluminium is 17 and Number of protons of aluminium = Number of electrons of aluminium
Why are fossil fuel resources sometimes referred to as "buried sunshine"?
Answer:
Fossil fuel resources sometimes referred to as "buried sunshine"? Because they make the Earth warm because they are found deep in the Earth and the energy stored in them was obtained from the sun long ago because they produce energy the same way the sun does all of the above.
Explanation:
Answer:
Explained
Explanation:
All plants or producers which there food by sunlight with help of a process called photosynthesis. These plants are eaten by consumers that is animals and plant eaters are eaten by animal eaters. In this process the energy is transmitted. Although the primary source of energy is sun. These plants and animals when dead are buried under the earth to form fossil fuels. This why fossils are sometimes referred as " buried sunshine"
In the seventeenth century, astronomer Johannes Kepler observed the planets revolving around our sun and analyzed data about them. He found that as the distance from the Sun increases, the amount of time it takes for the planet to go all the way around the Sun increases. Even though Kepler did not know why his observation was true, it has been found that planets in all solar systems always revolve around suns the same way.
Which best describes why Kepler’s observation of planetary motion is a law instead of a theory?
It does not discuss independent and dependent variables that can be observed or tested.
It does not provide an explanation for why the relationship exists between distance and orbit time.
A lot of new technology has been developed that can record more accurate data about planetary motion.
A lot of different understandings of why planets move have been developed, and Kepler’s provides the best explanation.
Answer:
"A lot of different understanding of why planets move have been developed, and Kepler's provides the best explanation."
Explanation:
All of the other three choices actually contradict the initial question which is asking why Kepler’s observation of planetary motion is a law instead of a theory. A law is a well established theory which means that it is an emergent truth that is known to be true. Kepler's laws have been verified and proven numerous times:) For a deductive proof of Kepler's laws look to Sir Isaac Newton.
The statement that best describes why Kepler’s observation of planetary motion is a law instead of a theory is, It does not provide an explanation for why the relationship exists between distance and orbit time.
What is Kepler's law of planetary motion?The law says that planets revolve in elliptical orbits around the Sun as a focus. Also, it covers the same area of space in the same amount of time while orbiting. The third law is orbital period of a planet is proportional to its semi-major axis.
The law gives the relation between time and distance according to second and third law. But, if we go about the reason, why is so? Then, it has no answers.
Thus, It does not provide an explanation for why the relationship exists between distance and orbit time.
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Think of a sport not usually considered to be dependent on muscular strength and endurance, like golf or tennis. How could an athlete's performance in the sport you've chosen be improved by increasing their level of muscular strength and endurance? Explain your reasoning.(make the paragraph at least 5 sentences and 35 words) WRITE MORE IF YOU WANT!!!!!!!!!!!
If they play tennis but build up more strength and endurance then they may be able to hit the ball better and not miss it
Even in sports like golf, which aren't traditionally considered to be heavily dependent on strength and endurance, players can greatly improve their performance by increasing their muscular strength and endurance.
In the sport of golf, often not considered heavily dependent on muscular strength and endurance, an athlete's performance can certainly be enhanced if they focus on improving their level of muscular strength and endurance. Increased muscular strength can be used to add distance to your shots, especially during long drives. Endurance, on the other hand, can be crucial for maintaining quality of play over a long period. Golf is not only about asserting strength, but also about the repetition of accurate, precise shots. Thus, muscular endurance would prevent the golfer from tiring out after a series of swings, keeping the performance consistently high.
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a simple pendulum has a period of 3secs. if the value of g is 9.9m/s^2. calculate the length of the pendulum
Answer:
2.3 m
Explanation:
A simple pendulum has a period of:
T = 2π √(L/g)
If T = 3 seconds and g = 9.9 m/s², then L is:
3 = 2π √(L/9.9)
3/(2π) = √(L/9.9)
(3/(2π))² = L / 9.9
L = 9.9 (3/(2π))²
L ≈ 2.3 m
To calculate the length of the pendulum, use the formula T = 2π√(L/g). Rearrange the formula, plug in the given values for T and g, and solve for L.
Explanation:To calculate the length of the pendulum, we can use the formula for the period of a simple pendulum which is T = 2π√(L/g). In this case, we are given that T = 3 sec and g = 9.9 m/s². Plugging in these values, we can rearrange the formula to solve for L:
T = 2π√(L/g)
3 = 2π√(L/9.9)
Squaring both sides of the equation, we get:
9 = 4π²(L/9.9)
Dividing both sides of the equation by 4π² and multiplying by 9.9, we get:
L = (9.9 * 9) / (4π²)
Calculating this expression, we find that the length of the simple pendulum is approximately 0.250 m.
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What is the source of the radioactivity in the sun
Answer:
Fusion of Hydrogen to form Helium
Explanation:
The sun is a big ball of gas and it provides solar energy that drives external processes on the earth surface.
The pressure and temperature within the sun provides energy to fuse abundant hydrogen atoms together to form helium atoms. This nuclear fusion process releases a huge amount of energy.
The fusion of hydrogen atoms to form helium is the source of radioactivity in the sun.
An atom is the smallest particle of matter
Answer:
yes
Explanation:
it makes up everything but you cant see it with out a microscope
which of the following occurs as a light wave bends when it passes from one medium to another
a constructive interference
b destructive interference
c refraction
d reflection
Refraction is a phenomenon in which a light wave bends or changes its direction when passing through a medium with a refractive index different from the other medium.
Being the refractive index [tex]n[/tex] is a number that describes how fast light propagates through a medium or material, and is defined as the relation between the speed of light in vacuum ([tex]c=3(10)^{8}m/s[/tex]) and the speed of light [tex]v[/tex] in the second medium:
[tex]n=\frac{c}{v}[/tex]
It is important to note that in this process, the wavelength may be modified because it depends on the medium, however, the refracted ray of light does not change its frequency.
The bending of a light wave as it passes from one medium to another is called refraction, which is caused by the change in speed of light in different indexes of refraction and is not related to constructive or destructive interference.
When a light wave bends as it passes from one medium to another, the phenomenon is known as refraction. Refraction occurs due to the change in speed of light as it enters a medium with a different index of refraction. This bending does not result from interference patterns such as constructive interference or destructive interference, which are related to the alignment of wave crests and troughs when two waves meet.
Constructive interference leads to an increase in amplitude when crests align with crests and troughs with troughs, whereas destructive interference occurs when crests align with troughs, canceling each other out. These interference effects are typically observed in phenomena such as light passing through narrow slits or thin films, not in the simple bending of light as it moves between different media.
Help with this.
....
Answer:
Explanation:
The x component is the adjacent side making up the given angle (39.4)
The vector is the hypotenuse.
The definition of the cos (x) is adjacent / hypotenuse.
cos(39.4) = adjacent / 47.3 Multiply both sides by 47.3
47.3 * cos(39.4) = adjacent Cos(39.4) = 0.7727
adjacent = 36.55
........................................................ waves are detected first because they move so fast .
.......................................... angles to the direction of movement .
A kind of scale used to measure the amount of seismic energy released by an earthquake : ................................
PRIMARY Waves Are Detected First Because They Move So Fast.
RIGHT Angles To The Direction of Movement.
A Kind Of Scale Used To Measure The Amount of Seismic Energy Released By An Earthquake RICHTER SCALE
An object that has the ability to do work has __________ energy.
Answer:
Kinetic energy. ( i didnt reallysee if someone answered already but if so, sorry!)
Answer:Kinetic energy
Explanation:
what term describes the rate at which electric energy is used
Answer:
Power (P)
Explanation:
In electromagnetism, power is defined as the rate at which electric energy is used:
[tex]P=\frac{E}{t}[/tex]
where
E is the electric energy
t is the time
Power is measured in Watts (W), where 1 W corresponds to 1 Joule per second (1 J/s).
In electric circuits, power can be also rewritten as
[tex]P=VI[/tex]
where
V is the voltage drop on the element we are considering
I is the current flowing through the element
The power dissipated through a resistor is also written as
[tex]P=I^2 R[/tex]
where I is the current through the resistor and R the resistance.
All of the elements heavier than oxygen are created by fusion reactions in _____.
All stars at birth begin to fuse hydrogen to form helium through nuclear fusion.
However, when the "fuel" of the star (hydrogen and helium) is exhausted, the star will become a red giant and begin to form other elements heavier than oxygen, and then when the star is in the supernova phase, it will generate the rest of the heavy elements that exist in the periodic table, which are even heavier than iron.
Therefore:
All of the elements heavier than oxygen are created by fusion reactions in red supergiants and supernovas.
In an effort to reduce greenhouse gas (GHG) emissions and improve fuel use, the Environmental Protection Agency (EPA) and the National Highway Traffic Safety Administration (NHTSA) are coordinating standards for the production of clean vehicles through. Which is not true as the regulations become stricter? A) Cars and trucks have larger engines. B) Vehicles have increased fuel economy. C) More efficient engines decrease emissions. D) Better emission filters diminish emissions.
Answer:
C
Explanation:
I think it could be C because, gasoline which is used by cars is a big factor in more emission being placed in the air. With electrical powered cars like Tesla, emission can decrease.
Sorry if i'm wrong
But, hope this helps :)
Answer:
The answer is A) Cars and trucks have larger engines.
Explanation:
it's right
heeeeelp urgent
I need an compare and contrast between energy and work.
20 pts.....
energy is the ability to do work while work is the dot product of force and displacement
Work is done by applying force. Energy is the ability to perform work or an action. Both are smaller units and are related closely.
Explanation:
Work is an act of overpowering resistance.It is done by applying force. It acts as evidence of empowerment of resistance form the application of force movement.
The capability to perform some work or action is Energy. Energy can take different forms like light, electrical, heat, etc. The energy in motion is work. The energy changes form one form to another by the process of work. Work can be of only two forms. It can be either positive or negative.
A small 17 kilogram canoe is floating downriver at a speed of 2 m/s. What is the canoe's kinetic energy?
Ke=34J. The canoe's kinetic energy floating downriver at a speed of 2m/s and 17kg mass is 34J.
This is a problem of kinetic energy, which is a form of energy, known as motion energy. The kinetic energy of an object is that which is produced because of its movements that depends on its mass and velocity.
The kinetic energy is represented by the following formula: Ke = ½ mv². The kinetic energy is measured in Joules (J), the mass in kilograms (kg) and the speed in meters over seconds (m/s).
A small 17kg canoe is floating downriver at a speed of 2m/s. Let's calculate canoe's kinetic energy.
Ke= (17kg)[(2m/s)²]/2= 68/2 kg m²/s²=34J
.
According to the law of conversion of matter, which chemical equation represents a possible chemical reaction
a. 2Na+ Cl2=2NaCl is the most possible chemical reaction that can occur
4 questions!! please Help!! 40 points!!
Answer: digital signals, near both poles, voltage, and the planets travel around Earth.
Explanation:
36. B. digital signal
Electronic signals that pulse current in a series of ones and zeros are known as Digital Signals. A digital signal refers to an electrical signal that is converted into a pattern of bits.
37. C. near both poles
The Magnet field would be strongest on both sides, the North and the south pole. It is equally strong at the north pole when compared with the south pole.
38. C. Voltage
A transformer is designed to convert alternating current from one voltage to another. It can be designed to "step up" or "step down" voltages
39. A. Earth travels around the sun
Earth travels around the sun, the gravity of the Sun keeps Earth and the other planets in their orbits. Just as the Moon orbits the Earth because of the pull of Earth's gravity, the Earth orbits the Sun because of the pull of the Sun's gravity.
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The energy transfer diagram represents the energy of a light bulb.
How much electrical energy is involved in this transformation?
60 J
80 J
100 J
120 J
Answer:
D) 120 J
Explanation:
EDG 2019-2020
The electrical energy is involved in this transformation will be 120 J. Option D is correct.
What is the law of conservation of energy?According to the law of conservation of energy, the energy of an isolated system stays unchanged throughout time; it is said to be conserved.
Energy can not be created nor be destroyed and can be transferred from one form to the other form.
We have an initial amount of electrical energy. Which is turned into two types of energy, electric and the light energy.
Electrical energy, (E)=?
Light energy (L)=100 J
Heat energy (H) =20 J
The equation is found as;
[tex]\rm E= L + H \\\\ E=100+20 \\\\ E=120 \ J[/tex]
Hence, the electrical energy is involved in this transformation will be 120 J.
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8.
An airplane sprinkles black soot on a snow-covered field. The soot will increase the rate that the snow melts because _____.
Black soot decreases the albedo of snow, leading to increased absorption of solar radiation and faster snow melting due to positive feedbacks in climate dynamics.
Explanation:An airplane sprinkles black soot on a snow-covered field. The soot will increase the rate that the snow melts because the darker-colored soot absorbs more solar radiation than the light-colored snow. Unlike snow, which has a high albedo and reflects most solar radiation, soot has a low albedo and thus absorbs more heat, leading to faster melting of the snow. This process is a part of positive feedbacks in climate dynamics, where an initial change is amplified by the effects it induces, such as increased absorption of solar energy leading to further melting.
A nonconservative force does the same work regardless of the path taken. True or false ?
Which scientist began organizing elements into the periodic table?
A. Alfred Wegener
B. Dmitri Mendeleev
C. Sir Isaac Newton
D. Sir Francis Bacon
Answer:
B. Dmitri Mendeleev
Explanation:
he invented it
Dmitri Mendeleev, a chemist scientist is the one who designed the periodic table by organizing elements.
Answer: Option B
Explanation:
Dmitri Mendeleev, a chemist scientist is represented as the father of the periodic table. He was a popular lecturer in Russia during the 1860’s. He also an author of the book ‘Principles of chemistry’. The elements are being organized based on their atomic weight and based on which he designed the periodic table.
You are the captain of a pirate ship and wish to find out how strong a new first mate is at rowing treasure from shore to the ship. It takes him 4 minutes (240 s) to row the treasure with a constant force of 500 N. What power does the pirate supply? A) 75 W B) 100 W C) 125 W D) 250 W
Answer:
C
Explanation:
Power is work divided by time:
P = W / t
Work is force times distance:
W = F d
Therefore:
P = F d / t
Given that F = 500 N, d = 60 m, and t = 240 s:
P = 500 N * 60 m / 240 s
P = 125 W
Answer is C.
You are the captain of a pirate ship and wish to find out how strong a new first mate is at rowing treasure from shore to the ship. It takes him 4 minutes (240 s) to row the treasure with a constant force of 500 N. The pirate supply 125 W of power.
What is force?
A force is an effect that can alter an object's motion according to physics. An object with mass can change its velocity, or accelerate, as a result of a force. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction.
Power is work divided by time:
P = W / t
Work is force times distance:
W = F d
Therefore:
P = F d / t
Given that F = 500 N, d = 60 m, and t = 240 s:
P = 500 N * 60 m / 240 s
P = 125 W
You are the captain of a pirate ship and wish to find out how strong a new first mate is at rowing treasure from shore to the ship. It takes him 4 minutes (240 s) to row the treasure with a constant force of 500 N. The pirate supply 125 W of power.
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How much force does the ground exert a 120 pourd person that is standing still?
Answer:
529.2 N
Explanation:
First of all, we need to convert the mass of the person into kg. We have:
1 pound = 0.45 kg
So
[tex]m=120 p \cdot 0.45 kg/p = 54 kg[/tex]
Now the force exerted by the ground on the man is equal to the weight of the man:
[tex]F=mg[/tex]
where
g = 9.8 m/s^2 is the acceleration due to gravity
Substituting
[tex]W=(54 kg)(9.8 m/s^2)=529.2 N[/tex]
A box experiencing a gravitational force of 600 N is being pulled to the right with force of 250 N. A 25 N frictional force acts on the box as it moves to the right.
Answer: 0 NEWTONS
Explanation:
How does the Earth release energy back into the atmosphere?
In general, the Earth releases energy back to the atmosphere through reflection, evaporation, and radiation. The Earth gets energy from the sunlight, part of which it absorbs, while part it reflects backwards, thus giving energy to the atmosphere. Also, the heating up of the Earth by the absorbed sunlight, radiates back in the lower layers of the atmosphere, again giving back energy to it. The water vapor is another way in which the Earth gives back energy tot he atmosphere as through the evaporation, the water vapor gets into the lower parts of the atmosphere and gives energy to it.
Look at the figure, which shows the motion of three balls. The curved paths followed by balls B and C are examples of _____. projectile motion rolling friction linear motion fluid friction
Answer:the answer is projectile motion
Explanation:
Answer:
projectile motion
Explanation:
The siren from a small town fire station is heard at a location 3 kilometers away. If the air temperature is 20°C, at what velocity did the sound travel? 319 m/s 331 m/s 343 m/s 387 m/s
Answer:
343 m/s
Explanation:
The velocity of sound in dry air varies with temperature as:
v ≈ 331.4 + 0.6 T
where v is velocity in m/s and T is temperature in degrees Celsius.
At 20°C:
v ≈ 331.4 + 0.6 (20)
v ≈ 343.4
So the sound traveled at approximately 343 m/s.