ICS Part 2 Physics Chapter 19 Short Questions Preparation

Question # 1

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 # 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

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 # 4

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 # 5

What is wave particle duality?

Ans 1: It says that light has dual nature;it travels in the form of waves but interacts with matter in the form of energy particle called as photon.e.g in interference ,reflection and polarization it show the properties of wave nature but in phenomena like pair production and compton's effect light acts as energy particle.

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

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 # 8

Distinguished between photoelectric effect and Compton effect.

Ans 1: The emission of electron from a metal surface when exposed to suitable frequency light is called photoelectric effect and when x rays are scattered by loosely bound electrons from graphite target the phenomena of change in wavelength is known as compton effect.

Question # 9

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 # 10

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.

Latest Educational News Stories

Pakistan's Largest Database of Colleges and Universities

BS Programs

University Past Papers

University Results

Exam Results 2024

Study Abroad Programs and Opportunities for Pakistani Students

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.

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

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

What do you understand by work function and stopping potential?

What is wave particle duality?

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

λ =h/mv

Define ionization potential and excitation potential.

Distinguished between photoelectric effect and Compton effect.

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

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

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.

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

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

What do you understand by work function and stopping potential?

What is wave particle duality?

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

λ =h/mv

Define ionization potential and excitation potential.

Distinguished between photoelectric effect and Compton effect.

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

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 2

Define pair production and annihilation of matter.

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

What are advantages of NAVSTAR navigation system?

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

Define Compton effect.

Define ionization potential and excitation potential.

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

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?

Can a pair production take place in vacuum?Explain

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

Define Stopping potential and Threshold frequency.

Can an object move with the speed of light?

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

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

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

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

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

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

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

Define Compton effect.

ICS Part 2 Physics Chapter 19 Short Questions Preparation

Share your comments & questions here

12th Class Physics
Short Questions Preparation