ICS Part 2 Physics Chapter 19 Short Questions Preparation

12th Class Physics
Short Questions Preparation

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Chapter 19
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Online Short Questions For Chapter 8 "ICS Part 2 Physics Chapter 19 Short Questions Preparation "

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Physics - ICS Part 2 Physics Chapter 19 Short Questions Preparation

Question # 1

Will the bright light ejects more from metal surface than dimmer light of tha same colour?

Ans 1: Since intensitynumber of electrons.
and bright lightis more intensethan dimmer one.So bright light will ejects more electrons than dimmer light.

Question # 2

Differentiate between special theory of relativity and general theory of relativity.

Ans 1: The special theory of relativity treats problem involving inertial or non accelerating frame of reference.
Ans 2: The general theory of relativity treats problem involving frames of reference accelerating with respect to one another.

Question # 3

Is it possible to create a single electron from energy?

Ans 1: No it is not possible to create single electron from energy.Because electron has negative charge and photon has no charge,

Question # 4

What do you understand by work function and stopping potential?

Ans 1: The minimum amount energy required to remove an electron from the surface of a metal is called work function.
And the stopping potential is the potential difference applied to stop the electrons from being ejected from the surface when the light falls on it.

Question # 5

What advantage of an electron microscope has over an optical microscope?

Ans 1:
- Resolving power of an electron microscope is 1000 times greater than that of optical microscope.
- Magnification of an electron microscope is also about 1000 times greater than that of optical microscope.
- 3-D image of remarkable quality can be obtained by electron.

Question # 6

When does light behaves as a wave?When does light behaves as a particle?

Ans 1: Light behave as a wave when it propagates from one place to other and light behave as a particle when it interacts with matter,Light behaves as a wave in interference and diffraction,Light behaves as a particle in photoelectric and Compton effect.

Question # 7

What do you know by annihilation of matter?

Ans 1: When a positron comes close to an electron,they annihilate and produce two photons in the gamma rays range.It is called annihilation of matter.

Question # 8

What are black body radiations and how can you get a black body?

Ans 1: An objects that absorbs all radiations falling on it,at all wavelength is called a black body.
When a body is heated ,it emits radiation its emission is called black body.
Black body is solid that has hollow cavity within it and a small hole through which radiations can enter or escape.The inside is blackened with suit to make it as good an absorber and as a bad reflector as possible.

Question # 9

Can a pair production take place in vacuum?Explain

Ans 1: No,pair production can not take place in vacuum.
In order to conserve the momentum and energy,their presence of heavy nucleus is essential,The vacuum has no particle or heavy nucleus,Therefore pair production can not take place in vacuum.

Question # 10

We do not notice the de-Broglie wavelength for a pitched cricket ball.Explain why?

Ans 1: According to de-Broglie hypothesis
λ =h/mv
As cricket ball has large mass,therefore wavelength of wavelength associated with it is so small that is not detectable.

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Prepare Complete Set Wise Questions For Chapter 8 "ICS Part 2 Physics Chapter 19 Short Questions Preparation "

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Set 2

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Set 3

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ICS Part 2 Physics Chapter 19 Short Questions Preparation - Set 1

Question # 1

Will the bright light ejects more from metal surface than dimmer light of tha same colour?

Ans 1: Since intensitynumber of electrons.
and bright lightis more intensethan dimmer one.So bright light will ejects more electrons than dimmer light.

Question # 2

Differentiate between special theory of relativity and general theory of relativity.

Ans 1: The special theory of relativity treats problem involving inertial or non accelerating frame of reference.
Ans 2: The general theory of relativity treats problem involving frames of reference accelerating with respect to one another.

Question # 3

Is it possible to create a single electron from energy?

Ans 1: No it is not possible to create single electron from energy.Because electron has negative charge and photon has no charge,

Question # 4

What do you understand by work function and stopping potential?

Ans 1: The minimum amount energy required to remove an electron from the surface of a metal is called work function.
And the stopping potential is the potential difference applied to stop the electrons from being ejected from the surface when the light falls on it.

Question # 5

What advantage of an electron microscope has over an optical microscope?

Ans 1:
- Resolving power of an electron microscope is 1000 times greater than that of optical microscope.
- Magnification of an electron microscope is also about 1000 times greater than that of optical microscope.
- 3-D image of remarkable quality can be obtained by electron.

Question # 6

When does light behaves as a wave?When does light behaves as a particle?

Ans 1: Light behave as a wave when it propagates from one place to other and light behave as a particle when it interacts with matter,Light behaves as a wave in interference and diffraction,Light behaves as a particle in photoelectric and Compton effect.

Question # 7

What do you know by annihilation of matter?

Ans 1: When a positron comes close to an electron,they annihilate and produce two photons in the gamma rays range.It is called annihilation of matter.

Question # 8

What are black body radiations and how can you get a black body?

Ans 1: An objects that absorbs all radiations falling on it,at all wavelength is called a black body.
When a body is heated ,it emits radiation its emission is called black body.
Black body is solid that has hollow cavity within it and a small hole through which radiations can enter or escape.The inside is blackened with suit to make it as good an absorber and as a bad reflector as possible.

Question # 9

Can a pair production take place in vacuum?Explain

Ans 1: No,pair production can not take place in vacuum.
In order to conserve the momentum and energy,their presence of heavy nucleus is essential,The vacuum has no particle or heavy nucleus,Therefore pair production can not take place in vacuum.

Question # 10

We do not notice the de-Broglie wavelength for a pitched cricket ball.Explain why?

Ans 1: According to de-Broglie hypothesis
λ =h/mv
As cricket ball has large mass,therefore wavelength of wavelength associated with it is so small that is not detectable.

Submit

ICS Part 2 Physics Chapter 19 Short Questions Preparation - Set 2

Question # 1

The rest mass of photon is zero.Is its momentum also zero?

Ans 1: No,The rest mass of photon is zero.It travels in the form of small energy packets which are of equal wavelength .When it is in motion,it possesses some mass.So it which it will also have momentum.

Question # 2

Will the bright light ejects more from metal surface than dimmer light of tha same colour?

Ans 1: Since intensitynumber of electrons.
and bright lightis more intensethan dimmer one.So bright light will ejects more electrons than dimmer light.

Question # 3

Distinguished between photoelectric effect and Compton effect.

Ans 1: The emission of electron from a metal surface when exposed to suitable frequency light is called photoelectric effect and when x rays are scattered by loosely bound electrons from graphite target the phenomena of change in wavelength is known as compton effect.

Question # 4

Define Compton effect.Write formula of Compton shift for scattering angle.

Ans 1: When X-rays are scattered by loosely bound electrons from a graphite target,the phenomena of change in wavelength is known as Compton Effect.Compton shift for scattering angle is given
$\lambda '-\lambda ={\frac {h}{m_{e}c}}(1-\cos {\theta }),$

Question # 5

If you are moving in a spaceship at very high speed relative to the earth.Would you notice difference(a)In your pulse rate(b)In the pulse rate of people on the earth?

Ans 1:
1. The pulse rate of the person inside the spaceship moving with large velociety will decrease.
2. The pulse rate of the people on the earth with respect to the person inside the spaceship with large velocity will increase.

Question # 6

Can a pair production take place in vacuum?Explain

Ans 1: No,pair production can not take place in vacuum.
In order to conserve the momentum and energy,their presence of heavy nucleus is essential,The vacuum has no particle or heavy nucleus,Therefore pair production can not take place in vacuum.

Question # 7

What are the measurement on which two observers in relative motion will always agree upon?

Ans 1: Two observe in relative motion will always agree upon
1. Force
2. Acceleration

Question # 8

What are black body radiations and how can you get a black body?

Ans 1: An objects that absorbs all radiations falling on it,at all wavelength is called a black body.
When a body is heated ,it emits radiation its emission is called black body.
Black body is solid that has hollow cavity within it and a small hole through which radiations can enter or escape.The inside is blackened with suit to make it as good an absorber and as a bad reflector as possible.

Question # 9

Which has the lower energy quanta,radio waves or x rays?Explain

Ans 1: Energy of quanta is given as E=hf-hc/lamda
Radio waves length has longer wavelength,Therefore radio waves has lower energy quanta.

Question # 10

What do you understand by work function and stopping potential?

Ans 1: The minimum amount energy required to remove an electron from the surface of a metal is called work function.
And the stopping potential is the potential difference applied to stop the electrons from being ejected from the surface when the light falls on it.

Submit

ICS Part 2 Physics Chapter 19 Short Questions Preparation - Set 3

Question # 1

Write at least two justification for light to behave as wave and as a particle.

Ans 1: Interference and diffraction confirms wave nature of light while photoelectric effect and compton effect confirms particle nature of light.

Question # 2

Define Compton effect.Write formula of Compton shift for scattering angle.

Ans 1: When X-rays are scattered by loosely bound electrons from a graphite target,the phenomena of change in wavelength is known as Compton Effect.Compton shift for scattering angle is given
$\lambda '-\lambda ={\frac {h}{m_{e}c}}(1-\cos {\theta }),$

Question # 3

Does the dilation mean that time really passes more slowly in moving system or that it only seems to pass more slowly.Explain briefly.

Ans 1: According to dilation formula
t= $\scriptstyle {\sqrt {1-{\frac {v^{2}}{c^{2}}}}}$ "
This relation show that a clock moving with respect to an observe appears to move slow then it does when it is at rest with respecttohim.So the moving clocks just appears to run slowly to the observer at rest.Hence time dilation is an apparent change and it only seems to pass more slowly but not actually.

Question # 4

Will the bright light ejects more from metal surface than dimmer light of tha same colour?

Ans 1: Since intensitynumber of electrons.
and bright lightis more intensethan dimmer one.So bright light will ejects more electrons than dimmer light.

Question # 5

What are black body radiations and how can you get a black body?

Ans 1: An objects that absorbs all radiations falling on it,at all wavelength is called a black body.
When a body is heated ,it emits radiation its emission is called black body.
Black body is solid that has hollow cavity within it and a small hole through which radiations can enter or escape.The inside is blackened with suit to make it as good an absorber and as a bad reflector as possible.

Question # 6

Photoelectric effect give the evidence of the particle nature of light,Explain it how?

Ans 1: If light were simple a wave like phenomena ,then increasing the intensity and thereby increasing the total energy failing on the surface would be expected to eventually provide enough energy to release electron no matter what the frequency .Furthermore in the classical picture one would expect the maximum energy of the emitted electrons to depend on the intensity of light--but it does not.So this is evidence that light behaves as if it were a particle.

Question # 7

Will higher frequency of light ejects greater number of electrons than low frequency of light?

Ans 1: No it will not,The number of ejected electrons depend upon the intensity of light.They are independently of frequency.

Question # 8

What are conclusion made from the pair production?

Ans 1: Pair production is the creation of an elementary particle and its antiparticle,Pair production offers refers specifically to a photon creating an electron positron pair near a nucleus but can more generally refer to any particle antiparticle pair creation.
Energy can be converted into mass according to E=mc²

Question # 9

As a solid is heated and begins to glow ,why does it first of its absolute.

Ans 1: Since the red light has longest wavelength ,so it will be emitted first and solid appears red first.

Question # 10

Differentiate between special theory of relativity and general theory of relativity.

Ans 1: The special theory of relativity treats problem involving inertial or non accelerating frame of reference.
Ans 2: The general theory of relativity treats problem involving frames of reference accelerating with respect to one another.

Submit

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ICS Part 2 Physics Chapter 19 Short Questions Preparation

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ICS Part 2 Physics Chapter 19 Short Questions Preparation

12th Class PhysicsShort Questions Preparation

12th Class Physics Chapter Wise Preparation

Online Short Questions For Chapter 8 "ICS Part 2 Physics Chapter 19 Short Questions Preparation "

Physics - ICS Part 2 Physics Chapter 19 Short Questions Preparation

Will the bright light ejects more from metal surface than dimmer light of tha same colour?

Differentiate between special theory of relativity and general theory of relativity.

Is it possible to create a single electron from energy?

What do you understand by work function and stopping potential?

What advantage of an electron microscope has over an optical microscope?

When does light behaves as a wave?When does light behaves as a particle?

What do you know by annihilation of matter?

What are black body radiations and how can you get a black body?

Can a pair production take place in vacuum?Explain

We do not notice the de-Broglie wavelength for a pitched cricket ball.Explain why?

λ =h/mv

Prepare Complete Set Wise Questions For Chapter 8 "ICS Part 2 Physics Chapter 19 Short Questions Preparation "

Set 1

Set 2

Set 3

ICS Part 2 Physics Chapter 19 Short Questions Preparation - Set 1

Will the bright light ejects more from metal surface than dimmer light of tha same colour?

Differentiate between special theory of relativity and general theory of relativity.

Is it possible to create a single electron from energy?

What do you understand by work function and stopping potential?

What advantage of an electron microscope has over an optical microscope?

When does light behaves as a wave?When does light behaves as a particle?

What do you know by annihilation of matter?

What are black body radiations and how can you get a black body?

Can a pair production take place in vacuum?Explain

We do not notice the de-Broglie wavelength for a pitched cricket ball.Explain why?

λ =h/mv

ICS Part 2 Physics Chapter 19 Short Questions Preparation - Set 2

The rest mass of photon is zero.Is its momentum also zero?

Will the bright light ejects more from metal surface than dimmer light of tha same colour?

Distinguished between photoelectric effect and Compton effect.

Define Compton effect.Write formula of Compton shift for scattering angle.

If you are moving in a spaceship at very high speed relative to the earth.Would you notice difference(a)In your pulse rate(b)In the pulse rate of people on the earth?

Can a pair production take place in vacuum?Explain

What are the measurement on which two observers in relative motion will always agree upon?

What are black body radiations and how can you get a black body?

Which has the lower energy quanta,radio waves or x rays?Explain

What do you understand by work function and stopping potential?

ICS Part 2 Physics Chapter 19 Short Questions Preparation - Set 3

Write at least two justification for light to behave as wave and as a particle.

Define Compton effect.Write formula of Compton shift for scattering angle.

Does the dilation mean that time really passes more slowly in moving system or that it only seems to pass more slowly.Explain briefly.

Will the bright light ejects more from metal surface than dimmer light of tha same colour?

What are black body radiations and how can you get a black body?

Photoelectric effect give the evidence of the particle nature of light,Explain it how?

Will higher frequency of light ejects greater number of electrons than low frequency of light?

What are conclusion made from the pair production?

As a solid is heated and begins to glow ,why does it first of its absolute.

Differentiate between special theory of relativity and general theory of relativity.

ICS Part 2 Physics Chapter 19 Short Questions Preparation

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