Question # 1

The existence of positron was discovered in:

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1929

1928

1931

1933

A positron is an anti particle of.

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Proton

Electron

Neutron

Photon

When the K.E. of photoelectric is zero, the frequency of incident photon is.

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Less than

greater than

Equal to

Much greater

A positron is an anti particle of.

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Proton

Electron

Neutron

Photon

Joule second is the unit of.

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Energy

Wein's constant

Planck's constant

Boyle's law

Albert Einstein got noble prize for service in:

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Pair production

Annihilation of matter theory

Compton effect

Photoelectric effect

The unit for Plank's constant is:

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Js^-1

Jm

Js

Jm²

The special theory of relativity based on.

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One postulate

Two postulates

Three postulates

Four postulates

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

Wave nature of particle was given by:

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Clemensen

Louis de Broglie

Laster H. Germer

Clinton S. Davisson

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

Energy of Black body radiation depends upon

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Nature of surface of body

Nature of material of body

Shape and size of body

Temperature of the body

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.

The position has charge which is in magnitude equal to the charge on

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Electron

Proton

β particle

All

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

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Threshold energy

Threshold frequency

Work function

Work ability

Internal frame is a frame is which

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1st law holds

2nd law holds

3rd law holds

Kelvin's law holds

Maximum Compton shift is observed at.

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30^oC

90^oC

45^oC

180^oC

Eintein's Photoelectric equation is E_k= hf -∅ in this equation E₁, refers to:

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K.E of al the emited electrons

Mean K.E of emited electrons

Maximum K.E of emited electrons

Minimum K.E of emited electrons

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