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

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 # 2

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 # 3

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 # 4

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 # 5

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 # 6

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.

Question # 7

Is it possible to create a single electron from energy?Explain

Ans 1: No it is not possible to create a single electron from energy.Creation of single electron will be against the law of conservation of charge and the law of conservation of momenteum.In pair production an electron positron pair is produces.

Question # 8

When light shine on surface,is momentum transferred to metal surface?

Ans 1: Yes when light shine on surface,momentum is transferred to metal surface and also the energy.So metal is heated up.

Question # 9

Define pair production and annihilation of matter.

Ans 1: Pair production:The change of very high energy photon into an electron,positron pair is called pair production.
Annihilation of matter:When a positron comes close to an electron,they annihilation and produce two photons in the gamma rays range.It is called annihilation of matter.

Question # 10

Define Compton effect.

Ans 1: The phenomena of increase in wavelength of x rays photon scattered by loosely bound electrons from a graphite target is called Compton Effect.

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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

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 # 2

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 # 3

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 # 4

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 # 5

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 # 6

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.

Question # 7

Is it possible to create a single electron from energy?Explain

Ans 1: No it is not possible to create a single electron from energy.Creation of single electron will be against the law of conservation of charge and the law of conservation of momenteum.In pair production an electron positron pair is produces.

Question # 8

When light shine on surface,is momentum transferred to metal surface?

Ans 1: Yes when light shine on surface,momentum is transferred to metal surface and also the energy.So metal is heated up.

Question # 9

Define pair production and annihilation of matter.

Ans 1: Pair production:The change of very high energy photon into an electron,positron pair is called pair production.
Annihilation of matter:When a positron comes close to an electron,they annihilation and produce two photons in the gamma rays range.It is called annihilation of matter.

Question # 10

Define Compton effect.

Ans 1: The phenomena of increase in wavelength of x rays photon scattered by loosely bound electrons from a graphite target is called Compton Effect.

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

Question # 1

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 # 2

Is it possible to create a single electron from energy?Explain

Ans 1: No it is not possible to create a single electron from energy.Creation of single electron will be against the law of conservation of charge and the law of conservation of momenteum.In pair production an electron positron pair is produces.

Question # 3

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 # 4

Can an object move with the speed of light?

Ans 1: As an object approaches the speed of light,its masses rises abruptly.If an object tries to travel 186,000 miles per seconds,its mass become infinite and so does the energy required to move it, For this reasons ,no normal object can be travel as fast as or faster than the speed of light.

Question # 5

Define Compton effect.

Ans 1: The phenomena of increase in wavelength of x rays photon scattered by loosely bound electrons from a graphite target is called Compton Effect.

Question # 6

Why can red light be used in a photographic dark room when developing films,but a blue or white light can not?

Ans 1: As we known red light has longest wavelength in visible spectrum,therefore it has less energy than that of blue or white light.So red light is least scattered on account of its large wavelength.Hence photographic films and the materials concerned are less affected in the presence of red light than high energy blue of white light.

Question # 7

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 # 8

Why don't we observe a Compton Effect with visible light?

Ans 1: The frequency of visible light is less than x rays,And the wavelength of visible light is much greater than the Compton of wavelength of electron,So compton effect can not observed with visible light.

Question # 9

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 # 10

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

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

Question # 1

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 # 2

Define work function and threshold frequency.

Ans 1: The minimum amount of energy required to remove electrons from a metal surface is called work function of this metal.
The minimum frequency below which photoelectric effect can not occur from a metal surface is called threshold frequency of this metal.

Question # 3

What are advantages of NAVSTAR navigation system?

Ans 1: NAVSTAR is used to locate the position and find the speed of an object anywhere on Earth up to to an accuracy of 2 cms^-1.

Question # 4

Define ionization potential and excitation potential.

Ans 1: Ionization potential:The potential necessary to remove an electron from the atom is called ionization potential,It is expressed in volts.
Ans 2: Excitation potential:The potential require to raise orbital electron in atom from one energy level to an other is called excitation potential.

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

When light shine on surface,is momentum transferred to metal surface?

Ans 1: Yes when light shine on surface,momentum is transferred to metal surface and also the energy.So metal is heated up.

Question # 7

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 # 8

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 # 9

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 # 10

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.

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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

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

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?

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

Can a pair production take place in vacuum?Explain

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

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

λ =h/mv

Is it possible to create a single electron from energy?Explain

When light shine on surface,is momentum transferred to metal surface?

Define pair production and annihilation of matter.

Define Compton effect.

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

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

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?

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

Can a pair production take place in vacuum?Explain

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

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

λ =h/mv

Is it possible to create a single electron from energy?Explain

When light shine on surface,is momentum transferred to metal surface?

Define pair production and annihilation of matter.

Define Compton effect.

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

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

Is it possible to create a single electron from energy?Explain

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

Can an object move with the speed of light?

Define Compton effect.

Why can red light be used in a photographic dark room when developing films,but a blue or white light can not?

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?

Why don't we observe a Compton Effect with visible light?

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

What are conclusion made from the pair production?

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

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

Define work function and threshold frequency.

What are advantages of NAVSTAR navigation system?

Define ionization potential and excitation potential.

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?

When light shine on surface,is momentum transferred to metal surface?

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

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

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?

ICS Part 2 Physics Chapter 19 Short Questions Preparation

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