Online Short Questions For Chapter 8 "ICS Part 2 Physics Chapter 19 Short Questions Preparation "

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Physics - ICS Part 2 Physics Chapter 19 Short Questions Preparation

Question # 1

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

Ans 1: Interference and diffraction confirms wave nature of light while photoelectric effect and compton effect confirms particle nature of light.

Question # 2

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 # 3

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 # 4

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

Ans 1: Yes when light shine on surface,momentum is transferred to metal surface and also the energy.So metal is heated up.

Question # 5

Is it possible to create a single electron from energy?

Ans 1: No it is not possible to create single electron from energy.Because electron has negative charge and photon has no charge,

Question # 6

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 # 7

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 # 8

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 # 9

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 # 10

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

Ans 1: Since intensitynumber of electrons.
and bright lightis more intensethan dimmer one.So bright light will ejects more electrons than dimmer light.

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Prepare Complete Set Wise Questions For Chapter 8 "ICS Part 2 Physics Chapter 19 Short Questions Preparation "

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Set 2

10 Questions
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Set 3

10 Questions
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ICS Part 2 Physics Chapter 19 Short Questions Preparation - Set 1

Question # 1

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

Ans 1: Interference and diffraction confirms wave nature of light while photoelectric effect and compton effect confirms particle nature of light.

Question # 2

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 # 3

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 # 4

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

Ans 1: Yes when light shine on surface,momentum is transferred to metal surface and also the energy.So metal is heated up.

Question # 5

Is it possible to create a single electron from energy?

Ans 1: No it is not possible to create single electron from energy.Because electron has negative charge and photon has no charge,

Question # 6

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 # 7

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 # 8

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 # 9

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 # 10

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

Ans 1: Since intensitynumber of electrons.
and bright lightis more intensethan dimmer one.So bright light will ejects more electrons than dimmer light.

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

Question # 1

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 # 2

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 # 3

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 # 4

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.

Question # 5

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

Ans 1: The special theory of relativity treats problem involving inertial or non accelerating frame of reference.
Ans 2: The general theory of relativity treats problem involving frames of reference accelerating with respect to one another.

Question # 6

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 # 7

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 # 8

Is it possible to create a single electron from energy?

Ans 1: No it is not possible to create single electron from energy.Because electron has negative charge and photon has no charge,

Question # 9

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 # 10

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

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

Question # 1

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 # 2

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 # 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 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 # 5

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 # 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

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 # 8

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

Ans 1: Yes when light shine on surface,momentum is transferred to metal surface and also the energy.So metal is heated up.

Question # 9

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 # 10

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
$\lambda '-\lambda ={\frac {h}{m_{e}c}}(1-\cos {\theta }),$

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Online Short Questions Preparations

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

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?

Define Compton effect.

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

Is it possible to create a single electron from energy?

State uncertainty principle.

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

Differentiate between inertial and non-inertial frame of reference.

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

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

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

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?

Define Compton effect.

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

Is it possible to create a single electron from energy?

State uncertainty principle.

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

Differentiate between inertial and non-inertial frame of reference.

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

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

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

What are conclusion made from the pair production?

What do you understand by work function and stopping potential?

Can an object move with the speed of light?

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

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

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

Define pair production and annihilation of matter.

Is it possible to create a single electron from energy?

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

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

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

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

Define Stopping potential and Threshold frequency.

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

What is wave particle duality?

Distinguished between photoelectric effect and Compton effect.

Can an object move with the speed of light?

What do you know by annihilation of matter?

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

What are conclusion made from the pair production?

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