ICS Part 2 Physics Chapter 19 Short Questions Preparation

Question # 1

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 # 2

Differentiate between inertial and non-inertial frame of reference.

Ans 1: A coordinate system in which the law of inertia is valid is called inertial frame of reference.It is non-accelerated frame of reference.
Ans 2: A coordinate system in which the law of inertia is not valid is called non-inertial frame of reference.It is accelerated frame of reference.

Question # 3

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 # 4

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 # 5

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 # 6

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 # 7

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 # 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

Define Stopping potential and Threshold frequency.

Ans 1: Stopping potential:The stopping potential is the potential difference applied to stop the electrons from being ejected from the surface when the light fall on it.
Threshold frequency:The minimum of frequency of incident light at which electrons are emitted from a surface is called threshold frequency.

Question # 10

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.

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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

Can a pair production take place in vacuum?Explain

Differentiate between inertial and non-inertial frame of reference.

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

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

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

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

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

What are conclusion made from the pair production?

Define Stopping potential and Threshold frequency.

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

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

Can a pair production take place in vacuum?Explain

Differentiate between inertial and non-inertial frame of reference.

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

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

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

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

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

What are conclusion made from the pair production?

Define Stopping potential and Threshold frequency.

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

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

Define Compton effect.

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

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

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

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

Define pair production and annihilation of matter.

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

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

Differentiate between inertial and non-inertial frame of reference.

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

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

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

Can a pair production take place in vacuum?Explain

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

What do you know by annihilation of matter?

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?

Differentiate between inertial and non-inertial frame of reference.

What are conclusion made from the pair production?

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

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

λ =h/mv

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

ICS Part 2 Physics Chapter 19 Short Questions Preparation

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