Question # 1

The existence of positron in 1928 was predicted by

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Anderson

Dirac

Chadwick

Plank

The materialization of energy take place in the process of.

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Photo electric effect

Compton Effect

Pair production

Annihilationof matter

In the equation if f₂ > then

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In Compton scatting, the value of shift is equal to Compton's wavelength, when X-rays is scattered at the angle of.

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90^oC

Zero

120^oC

45^oC

The value of Wien's constant:

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2.9x10^-3mk

2.19x10^-7mk

3.18 x10⁶ km^-1

6.21 x 10^-9m²wk³

The special theory of relativity based on.

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One postulate

Two postulates

Three postulates

Four postulates

Maximum Compton shift is observed at.

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30^oC

90^oC

45^oC

180^oC

Internal frame is a frame is which

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1st law holds

2nd law holds

3rd law holds

Kelvin's law holds

Photodiode is used for wave nature of.

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Light

Thermal radiation

Radi waves

Sound waves

In Compton effect the photon behaves as a.

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Wave

Particle

Nucleon

Both a and b

The most refined form of matter is:

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Smoke

Light

Ice

Fog

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

The unit of work function is

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Electron volt

Ampere

Volt cell

Hz

If an object moves with speed of light, its mass will be.

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Zero

Maximum

Minimum

infinity

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

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500^oC

900^oC

1100^oC

1300^oC

The principle regarding the dual nature of light was first discovered by

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Compton

J.J.Thomson

De-Broglie

Heisenberg

Compton shift is maximum for scattering angle of photon

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0^o

90^o

180^o

45^o

A positron is an anti particle of.

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Proton

Electron

Neutron

Photon

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