The location of the center of our galaxy was first determined by observations of

Answer: 27.3 days.

Explanation: The Moon actually takes 27.3 days to complete one orbit around Earth. The Moon takes 29.5 days to complete one cycle of phases.

Answer:

= 54,000 Joules or 54 kJ

Explanation:

Electrical energy is given by the formula;

E = VIt; where V is the potential difference in volts, I is the current and t is the time in seconds.

Therefore;

Electrical energy = 120 V × 0.50 A × 15 ×60 seconds

                            = 54,000 Joules

Thus; the electrical energy is 54,000 joules or 54 kJ

Answer:

B. 47-54 miles/hour

Explanation:

Gale is a strong wind which is depicted by red warning flag. According to U.S. National Weather Service gale is a sustained surface wind. It is also used to refer winds from tropical coastal areas.

On the basis of force of wind gale is divided in four groups:

Answer: 47-54

Explanation:

B, larceny because that's theft of personal property.

Final answer:

The width of the central bright spot in a single-slit diffraction pattern doubles if the wavelength or distance to the screen is doubled and halves if the slit width is doubled.

Explanation:

The width of the central bright spot in a single-slit diffraction pattern will change based on a few factors:

If the wavelength of the light is doubled, the width of the central bright spot will also double, since the width of the central maximum is directly proportional to the wavelength.

If the slit width is doubled, the width of the central bright spot will be halved, as the width of the central maximum is inversely proportional to the slit width.

If the distance from the slit to the screen is doubled, the width of the central bright spot will also double, due to similar triangles, where the pattern's size changes linearly with the distance to the screen.

An ion is an atom that is electrically charged by gaining or losing one or more electrons.

To understand it better:

An atom has a nucleus with electrons around it and has a neutral charge. When an electron is added or detached, this atom is electrically charged, that is, it ceases to have a neutral charge and becomes an ion.

In this sense, there are two types of ions:

-Anions: ions negatively charged, by the gain of electrons in the atom.

-Cations: ions positively charged, by the loss of electrons in the atom.

Final answer:

An atom that has an unequal number of electrons and protons is called an ion. This imbalance creates an ion with a net positive or negative charge, called a cation or an anion respectively.

Explanation:

An atom with an imbalance of electrons to protons is known as an ion. Atoms are normally electrically neutral because they have an equal number of protons and electrons. However, when atoms gain or lose electrons, they become ions, which can be either positively or negatively charged. This imbalance in charge leads to electrical forces that can cause the ion to interact with other ions or molecules.

A positive ion, called a cation, is formed when an atom loses one or more electrons. Conversely, a negative ion, referred to as an anion, is created when an atom gains electrons. The process of an atom becoming an ion is called ionization, and these ions play a crucial role in chemical reactions and the formation of compounds.

Answer:

5.025 atm

Change the 2.01 to ml then cross multiply

400/1= 2010/x

210/400=5.025

Answer:

The lines of the magnetic field from a bar magnet form closed lines. By convention, the field direction is taken to be outward from the North pole and into the South pole of the magnet. Permanent magnets can be made from ferromagnetic materials.

As can be visualized with the magnetic field lines, the magnetic field is strongest inside the magnetic material. The strongest external magnetic fields are near the poles. A magnetic north pole will attract the south pole of another magnet, and repel a north pole.

A bar magnet's magnetic field is shown with lines that form loops from the North pole to the South, through the magnet, and back to the North. The direction of the magnetic field is tangent to the field line and can be determined by a compass.

The magnetic field in a bar magnet can be visualized using magnetic field lines. These lines emerge from the North pole (N), loop around to the South pole (S), and continue through the bar magnet back to the North pole, forming complete loops. This loop pattern shows that magnetic field lines never stop.

The direction of the magnetic field is tangent to the field line at any point in space. A small compass will point in the direction of the field line, which also indicates that the field lines point in the direction that the North pole of a compass would point.

The magnitude of the magnetic field is represented by the density of the field lines: the stronger the magnetic field, the denser the field lines. The magnetic field is strongest at the center and weakest just outside the bar magnet, between the two poles. Consequently, the field lines are densest at the center and least dense between the poles.

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f = 9.60 cm

m = -3.40  ( because the image is inverted the number is negative)

u = distance

M = f / f-u

-3.40 = 9.60 / (9.60 - u)

Solve for u:

u = 12.42 cm  (Round answer as needed.)

from farthest to the nearest

Neptune

Uranus

saturn

Jupiter

mars

earth

venus

mercury

Answer:

I mean since this is just telling where the normal line of the planets is and not a Jovian etc.

Explanation:

It's just asking the order from smallest to greatest. Just flip it the other direction if it's largest to smallest.

the answer is A *but I am not sure*

Answer: reflected

A material is opaque when it does not allow light to pass through itself.

In other words:

When light illuminates an opaque object, no ray passes through it, as most of the light is reflected or absorbed by the object.

In this context, the main characteristic of this type of objects is that the color of the material depends on the light it absorbs. It means that depending on its chemical composition they can absorb certain wavelengths (colors) and reflect others.

Therefore, the color we see in an object is the light it reflects. For example, if we see a red table, this means that when light iluminates it, this table absorbed all the visible wavelengths, except the red, which is the light that is reflected and perceived by our eyes.

Answer:

Paramagnetic materials are attracted by external magnetic fields whereas diamagnetic materials are repelled. Paramagnetic materials have at least one unpaired electron in the system, but diamagnetic materials have all their electrons paired.

Explanation:

Diamagnetic materials are weakly repelled by magnetic fields due to induced dipoles aligning oppositely, while paramagnetic materials are weakly attracted due to their unpaired electrons aligning with the field. Copper and gold are examples of diamagnetic materials, whereas aluminum and magnesium are examples of paramagnetic materials.

Diamagnetic and paramagnetic materials respond differently to magnetic fields due to their distinct atomic properties.

Diamagnetism is characterized by a weak repulsion from magnetic fields. This occurs because the atoms in diamagnetic materials have no permanent magnetic dipole moments. When an external magnetic field is applied, it induces magnetic dipoles within the atoms. These induced dipoles align oppositely to the applied field, creating a repulsive effect. When the field is removed, the induced magnetic effect vanishes.

Examples of diamagnetic materials include copper, gold, and silicon.

Paramagnetism involves a weak attraction to magnetic fields. The atoms in paramagnetic materials have unpaired electrons, which results in permanent magnetic dipole moments. When an external magnetic field is applied, these dipoles tend to align with the field, enhancing its effect. However, this alignment is temporary and disappears when the external field is removed.

Examples of paramagnetic materials include aluminum, magnesium, and platinum.

Answer:The window becomes wet.

Explanation: When the water vapor condenses, the vapor is changing into its liquid form. In this case, the vapor condenses into liquid water.

Humid/ wet. You will see drops on the inside of the window. Condensation is the change from a gas to a liquid.

Using the mirror formula.

1/v + 1/u = 1/f

1/9.5 + 1/3.2 = 1/f

1/f = 3.2 + 9.5 / 9.5 * 3.2

1/f = 4.82 cm

Radius = 2f

Radius = 2 x 4.82

Radius = 9.64 cm

Answer:

Radius of curvature, R =  9.64 cm              

Explanation:

It is given that,

Object distance, u = -9.5 cm

Image distance, v = 3.2 cm

We have to find the radius of curvature of the mirror. The relationship between focal length and the radius of curvature as R = 2 f where f is the focal length of the mirror.

Using Mirror's formulas as :

[tex]\dfrac{1}{v}+\dfrac{1}{u}=\dfrac{1}{f}[/tex]

[tex]\dfrac{1}{3.2}+\dfrac{1}{-9.5}=\dfrac{1}{f}[/tex]

f = 4.82 cm

And radius of curvature of the mirror becomes, R = 9.64 cm. Hence, this is the required solution.

Answer:

A.

Explanation:

Answer: Option A

Explanation: Waves (mechanical and electromagnetic) can transfer energy when they impact into something.

When a boat speeds in the water, the boat itself pushes water around it generating mechanical waves in the water, those mechanical waves now travel on the surface of the water. When those mechanical waves impact the buoy, the waves also move the buoy, and now the buy is in a "wave-like" motion (you can model the movement of the buoy as a mechanical wave, that goes up and down), so this is a good example of energy transfer.

Answer:

b. If a bar magnet is cut in half, two new magnets will be formed each with a south and north pole

Explanation:

As we know that magnetic field lines always originates from north pole of magnet and then terminate at south pole.

Also all magnets must have two poles (i) North pole (ii) South Pole

now if we break a magnet into two parts then this magnet will again form two new poles on the opposite sides so that each half will again have two different poles of magnet

So here we can say that when a bar magnet is cut into two parts then each part will behave like a new magnet.

so correct answer will be

b. If a bar magnet is cut in half, two new magnets will be formed each with a south and north pole

Final answer:

Bar magnets have a magnetic field direction from the north pole to the south pole externally, and cutting a bar magnet in half results in two new magnets each with a north and a south pole. The north pole of a magnet aligns with the Earth's magnetic South Pole.

Explanation:

The truth about bar magnets can be understood by examining their properties and behaviors:

Work = (force) x (distance)

Work = (30 N) x (15 m)

Work = 450 Joules

Power = (work done) / (time to do the work)

Power = (450 Joules) / 8 seconds)

Power = 56.25 watts

Microwave background radiation was accidentally discovered by Penzias and Wilson on 1964. This is a form of electromagnetic radiation that is present in the whole universe and completely fills it (it is isotropic).

Its frequency belongs to the microwaves range and is one of the main demonstrations of the of the Big Bang theory model.  

It is important to note the Big Bang occurred 400,000 years before the events related to the microwave cosmic radiation, this means the Big Bang occurred first.  

The incorrect statement about cosmic background radiation is that it's a mixture of radiation from many independent sources like stars and galaxies. It is actually the thermal radiation left over from the Big Bang.

The statement B) It is the result of a mixture of radiation from many independent sources, such as stars and galaxies, is not true regarding cosmic background radiation. Cosmic background radiation is not a mixture of radiation from different sources, but actually the thermal radiation leftover from the 'Big Bang'. It's effectively the 'echo' or 'afterglow' of the Big Bang, and it appears essentially the same in all directions, which means it's isotropic.

It has a temperature of approximately 3 degrees Kelvin (just above Absolute Zero), as discovered by Arno Penzias and Robert Wilson in the early 1960s. This radiation was much hotter in the past, but has cooled as the universe expanded over billions of years.

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Answer:water is more dense

Explanation:

Answer:

[tex]P_a = P_b[/tex]

Explanation:

As per Pascal's law we know that when liquid is at rest then the pressure due to liquid at all points lying at the same level will be same

So here as per given figure we know that two points are lying at the same level under the water level

As per pascal's law the pressure at point points will be same

So correct answer will be

[tex]P_a = P_b[/tex]

Explanation:

This problem can be solved using the Radioactive Half Life Formula:

[tex]A=A_{o}.2^{\frac{-t}{h}}[/tex]     (1)

Where:

[tex]A[/tex] is the final amount of radioisotope  (decay rate)

[tex]A_{o}=7200Bq[/tex] is the initial amount of the radioisotope

[tex]t=22min[/tex] is the time elapsed

[tex]h=5.50min[/tex] is the half life of the radioisotope

Knowing this, let's find [tex]A[/tex] from (1):

[tex]A=(7200Bq).2^{\frac{-22min}{5.50min}}[/tex]     (2)

[tex]A=(7200Bq).2^{(-4)}[/tex]    

[tex]A=(7200Bq)(0.0625)[/tex]     (3)

Finally:

[tex]A=450 Bq[/tex]>>> This is the decay rate of the radioisotope

Note it is in Becquerels (Bq), which is the derived unit approved by the International System of Units for radioactivity

Answer:

Th-234, Pa-234

Explanation:

In alpha decay, 2 protons and 2 neutrons are lost.  So U-238 would become Th-234.

In beta decay, one neutron is turned into a proton.  So Th-234 would become Pa-234.

de Broglie wavelength (λ) is given by the equation

λ = h/p

where h=Planck’s constant whose value is 6.62 x 10^(−34) joule-seconds and

p = momentum of the particle(here electron)

In terms of kinetic energy(E) momentum(p) can be written as,

p=(2mE)^1/2

where m=mass of the particle.

Hence λ becomes

1 λ = h(2mE)^-1/2

Given here, E = 13.6 eV = 13.6×1.6×10^-19 joule

m(mass of electron)= 9.1×10^-31 kg

Putting these values in equation (1) we get ,

λ =0.332×10^(-9) meter

=3.32×10^(-10) meter

=3.32 Å

De Broglie wavelength of an electron in the ground state of the hydrogen atom is about 3.33 × 10⁻¹⁰ m

[tex]\texttt{ }[/tex]

The term of package of electromagnetic wave radiation energy was first introduced by Max Planck. He termed it with photons with the magnitude is :

[tex]\large {\boxed {E = h \times f}}[/tex]

where:

E = Energi of A Photon ( Joule )

h = Planck's Constant ( 6.63 × 10⁻³⁴ Js )

f = Frequency of Eletromagnetic Wave ( Hz )

[tex]\texttt{ }[/tex]

Let's recall De Broglie's Wavelength Formula as follows:

[tex]\boxed{\lambda = \frac{h}{mv}}[/tex]

where:

λ = wavelength ( m )

h = Planck's Constant ( 6.63 × 10⁻³⁴ Js )

m = mass of object ( kg )

v = velocity of object ( m/s )

Let us now tackle the problem !

[tex]\texttt{ }[/tex]

Given:

energy of the ground state of the hydrogem atom = E = 13.6 eV = 2.176 × 10⁻¹⁸ J

Asked:

wavelength of electron = λ = ?

Solution:

Firstly , we will calculate the speed of the electron :

[tex]E = E_k[/tex]

[tex]E = \frac{1}{2}mv^2[/tex]

[tex]v^2 = 2E \div m[/tex]

[tex]\boxed{v = \sqrt{ 2E \div m } }[/tex] → Equation A

[tex]\texttt{ }[/tex]

Next, we will use the formula of The Broglie's Wavelength:

[tex]\lambda = \frac{h}{mv}[/tex]

[tex]\lambda = \frac{h}{m\sqrt{ 2E \div m }}[/tex] ← Equation A

[tex]\lambda = \frac{6.63 \times 10^{-34}}{9.11 \times 10^{-31} \sqrt{ 2 \times 2.176 \times 10^{-18} \div 9.11 \times 10^{-31} }}[/tex]

[tex]\boxed{\lambda = 3.33 \times 10^{-10} \texttt{ m}}[/tex]

[tex]\texttt{ }[/tex]

[tex]\texttt{ }[/tex]

Grade: College

Subject: Physics

Chapter: Quantum Physics

Answer:

They will be attracted.

Explanation:

They will be attracted because the negatives block the positive in the right balloon and positive attracts negative. Also, the positive attracts the negative in the left balloon. Therefore, they will be attracted. Hope this helps.

Answer:

they will atract eachother

Explanation:

Answer:

ligma

Explanation:

Answer:

Protons = 50

Mass number = 119

Explanation:

A neutral of tin, Sn, has a Z value of 50 and neutrons are 69.

Z is the atomic number. The atomic number is equal to number of protons or number of electrons in an atom that is neutral i.e:

Z = PROTONS = ELECTRONS

So the number of protons = 50 since Z is 50

>>>>>>>>>>>>>>>¦

The bulk of the mass of an atom is concentrated in the nucleus. To calculate mass number, we simply sum all the elementary particles in the nucleus i.e protons and neutrons. These particles are called the nucleons.

Mass number (A) = P + N

= 50 + 69

= 119

Answer: 119

Explanation:

answers to electronic devices quiz

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potential energy is energy that is stored and kinetic energy is energy in motion and I believe that if you try to put them together it might not work potential energy would be a minus in the side for kinetic energy would be a plus sign

As opposites attract, Potential energy is pulled to Kinetic energy. The force from Kinetic energy is working on potential energy over a distance. This means the potential energy (q )started with is being converted into kinetic energy (Q). Potential energy is accelerating and picking up speed.  

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B.

because N -pole and S-pole attrack

Answer:

Opposite poles attract each other, similar poles repel.

Explanation:

(Unlike or different poles)