ICS Part 2 Physics Chapter 19 Short Questions Preparation

Question # 1

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 # 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

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 # 4

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 # 5

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 # 6

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 # 7

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 # 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

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 # 10

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.

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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 work function and threshold frequency.

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?

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

What are conclusion made from the pair production?

State uncertainty principle.

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

What are advantages of NAVSTAR navigation system?

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

What do you understand by work function and stopping potential?

Differentiate between inertial and non-inertial frame of reference.

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 work function and threshold frequency.

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?

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

What are conclusion made from the pair production?

State uncertainty principle.

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

What are advantages of NAVSTAR navigation system?

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

What do you understand by work function and stopping potential?

Differentiate between inertial and non-inertial frame of reference.

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

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

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

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

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

Can an object move with the speed of light?

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

What do you understand by work function and stopping potential?

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

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

Define work function and threshold frequency.

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.

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

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

Can an object move with the speed of light?

What do you understand by work function and stopping potential?

What are conclusion made from the pair production?

What are advantages of NAVSTAR navigation system?

Define Compton effect.

State uncertainty principle.

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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