ICS Part 2 Physics Chapter 19 Short Questions Preparation

Question # 1

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 # 2

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 # 3

State uncertainty principle.

Ans 1: The product of uncertainty in the measurement of momentum and uncertainty in the measurement of position of an electron is approximately equal to Planck's constant.
The product of uncertainty in the measurement of energy and uncertainty in the measurement of time of an electron is approximately equal to Planck's constant.

Question # 4

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 # 5

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 # 6

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 # 7

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 # 8

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 # 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

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.

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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

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

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

State uncertainty principle.

What do you know by annihilation of matter?

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

Differentiate between inertial and non-inertial frame of reference.

Can an object move with the speed of light?

Can a pair production take place in vacuum?Explain

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

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

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

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

State uncertainty principle.

What do you know by annihilation of matter?

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

Differentiate between inertial and non-inertial frame of reference.

Can an object move with the speed of light?

Can a pair production take place in vacuum?Explain

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

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

What is wave particle duality?

Define pair production and annihilation of matter.

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

What are advantages of NAVSTAR navigation system?

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?

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

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

What do you understand by work function and stopping potential?

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 3

What do you understand by work function and stopping potential?

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

Define Stopping potential and Threshold frequency.

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

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

State uncertainty principle.

Define work function and threshold frequency.

Can a pair production take place in vacuum?Explain

Can an object move with the speed of light?

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

ICS Part 2 Physics Chapter 19 Short Questions Preparation

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