Question # 1

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

Maximum Compton shift is observed at.

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30^oC

90^oC

45^oC

180^oC

A perfect absorber must also be perfect

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Cavity

Sources of radiation

Radiator

None of these

The photon with energy greater than 1.02 MeV can interact with matter as.

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Photoelectric effect

Compton effect

Pair production

annihilation of matter

The Compton effect is associated with

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X-rays

y-rays

Positive rays

ß-rays

Compton's effect is associated with

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gamma rays

Beta rays

X rays

Positive rays

The mass of an object will be doubled at speed.

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2.6 x 10⁸ m/s

1.6 x 10⁸m/s

2.6 x 10⁷m/s

3.6 x 10⁷ m/s

Photodiode is used for wave nature of.

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Light

Thermal radiation

Radi waves

Sound waves

1 kg mass will be equivalent to energy.

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9 x 10⁸ J

9 X 10¹² J

9 X 10¹⁶ J

9 X 10¹⁹ J

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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The existence of positron was discovered in:

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1929

1928

1931

1933

The emission of electrons from metal surface when exposed to light is called:

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Compton effect

Pair production

Photoelectric effect

None of above

When a very high energy modeules such as y radiation interact with matter, the phenomenon arising will be.

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Photoelectric effect

Compton effect

Pair production

Annihilation of matter

Compton effect proves.

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Wave nature of radiation

Wave nature of particle

Dual nature of particle

Particle nature of radiations

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

Unit of Stephen's constant is

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W m K^-2

W m^-2 K^-4

W m K^-4

None

Compton shift is maximum for scattering angle of photon

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0^o

90^o

180^o

45^o

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