Question # 1

Pair production occurs only when energy of photon is at least equal in:

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1.02keV

1.02 eV

1.02 MeV

1.02 GeV

The unit for Plank's constant is:

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Js^-1

Jm

Js

Jm²

The photoelectric effect predicts that light is made of

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Photons

Neutrons

Protons

None of these

Potassium Cathodes in photocell emit electrons for a light.

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Visible

Infra red

Ultra violet

X rays

The number of electrons emitted depends upon

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Colour of target surface

Shape of surface

Frequency of incident light

Intensity of incident light

A positron is an anti particle of.

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Proton

Electron

Neutron

Photon

The special theory of relativity based on.

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One postulate

Two postulates

Three postulates

Four postulates

The wavelength associated with the protons moving at speed of 40 m/s is.

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7.20 nm

9.02

15.7 nm

17.3 nm

Photodiode is used for wave nature of.

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Light

Thermal radiation

Radi waves

Sound waves

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

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Threshold energy

Threshold frequency

Work function

Work ability

All motions are

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Absolute

Uniform

Relative

Variable

The unit of work function is

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Electron volt

Ampere

Volt cell

Hz

Max planck received noble prize in:

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1927

1932

1918

1914

The minimum energy required for occurrence of pair production is:

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1.022eV

1.02keV

1.02Me.V

1.04MeV

The dimensions of Plank's constant is same as that of.

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Energy

Power

Acceleration

Angular momentum

When platinum wire is heated, it changes to cherry red at temperature.

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500^oC

900^oC

1100^oC

1300^oC

Unit of Stephen's constant is

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W m K^-2

W m^-2 K^-4

W m K^-4

None

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