ICS Part 2 Physics Chapter 19 Short Questions Preparation

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

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 # 3

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 # 4

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 # 5

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 # 6

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 # 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

A satellite is orbiting around earth.Is its frame of reference inertial or non-inertial ?Justify your answer.

Ans 1: The motion of the satellite is synchronized with the earth so it is in the same frame of reference in which earth lies.Hence the frame of reference will be inertial.

Question # 9

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 # 10

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.

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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

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

Define Compton effect.

Differentiate between inertial and non-inertial frame of reference.

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

Define pair production and annihilation of matter.

Can an object move with the speed of light?

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

A satellite is orbiting around earth.Is its frame of reference inertial or non-inertial ?Justify your answer.

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

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

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

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

Define Compton effect.

Differentiate between inertial and non-inertial frame of reference.

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

Define pair production and annihilation of matter.

Can an object move with the speed of light?

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

A satellite is orbiting around earth.Is its frame of reference inertial or non-inertial ?Justify your answer.

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

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

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

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

λ =h/mv

Define pair production and annihilation of matter.

Define Stopping potential and Threshold frequency.

Give two postulate of special theory of relativity.

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

A satellite is orbiting around earth.Is its frame of reference inertial or non-inertial ?Justify your answer.

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

Can a pair production take place in vacuum?Explain

Define ionization potential and excitation potential.

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

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

Differentiate between inertial and non-inertial frame of reference.

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

What is wave particle duality?

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

Define pair production and annihilation of matter.

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

Define Stopping potential and Threshold frequency.

Can an object move with the speed of light?

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

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

ICS Part 2 Physics Chapter 19 Short Questions Preparation

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