Question # 1

Wave nature of light appears in

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Pair production

Compton effect

Photo electric

Interference

A positron is an anti particle of.

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Proton

Electron

Neutron

Photon

The numerical value of Compton wavelength is equal to

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3.43 x 10^-12 m

1.43 x 10^-12m

2.43 x 10^-12m

0.43 x 10^-12m

Minimum energy needed to escape an electron ofrm metal surface is called:

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Threshold energy

Threshold frequency

Work function

Work ability

Unit of Stephen's constant is

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W m K^-2

W m^-2 K^-4

W m K^-4

None

In an nihilation emitted photons moves in opposite directions to conserve.

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Mass

Charge

Energy

Momentum

Antiparticle of electron is.

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proton

Photon

Positron

Neutron

De-Broglie waves are associated with

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Moving charged particles only

Moving neutral particles only

All moving particles

All parties whether in motion or at rest

Which one of the following physical quantities change with relativistic speed?

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Length

Time

Mass

All of above

All motions are

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Absolute

Uniform

Relative

Variable

If the energy of photon is 10 eV and work function is 5 eV, then the a value of stopping potential will be

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50 V

2 V

5 V

15 V

Compton's effect is associated with

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gamma rays

Beta rays

X rays

Positive rays

The minimum frequency needed to emit an electron form metal surface is called:

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Work function

Threshold frequency

Quanta frequency

All of above

The maximum kinetic energy of emitted photo electrons depends upon.

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The intensity of incident light

Frequency of the incident light

Metal surface

Both frequency of incident light and metal surface.

Photo electrons are emitted y using visible light when the metal is.

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sodium

Copper

Nicked

Cobalt

Pair production cannto take place in vacuum because :

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Mass in not conserved

Momentum is not conserved

Energy is not conserved

Charge is not conserved

The special theory of relativity based on.

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One postulate

Two postulates

Three postulates

Four postulates

The unit for Plank's constant is:

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Js^-1

Jm

Js

Jm²

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