Question # 1

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

A block body is an ideal:

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Absorber

Radiator

Both a & b

None of above

The stopping potential for a certain metal is 10 volts. Thus work function for the cathode is.

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10 J

1.6 X 10^-18 J

1.6 X 10^-19 J

1.6 X 10³⁰ J

Albert Einstein got noble prize in:

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1926

1921

1918

1931

The unit of work function is

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Electron volt

Ampere

Volt cell

Hz

Einstein photoelectric equation is

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None of these

The minimum energy required for occurrence of pair production is:

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1.022eV

1.02keV

1.02Me.V

1.04MeV

The concept of direction is purely

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Relative

Absolute

Relative to the motion

None of these

The converses of annihilation of matter is:

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Photoelectric effect

Relativistic effect

Pair production

Compton effect

By modern system of NAVSTAR, the speed any where on the earth can be determined to accuracy about.

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20 ms-1

10 ms-1

2 cms-1

2 ms-1

When platinum is heated is become dull red at:

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900°C

500°C

800°C

1100°C

The existence of positron was discovered in:

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1929

1928

1931

1933

The Compton effect is associated with

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X-rays

y-rays

Positive rays

ß-rays

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

When platinum is it becomes orange at.

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500^oC

900^oC

1100^oC

1300^oC

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Wien's constant

Planck's constant

Davison constant

Lumber's constant

Unit of Stephen's constant is

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W m K^-2

W m^-2 K^-4

W m K^-4

None

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

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