Question # 1

The converses of annihilation of matter is:

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Photoelectric effect

Relativistic effect

Pair production

Compton effect

The minimum energy required for occurrence of pair production is:

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1.022eV

1.02keV

1.02Me.V

1.04MeV

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

Wave nature of light appears in

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Pair production

Compton effect

Photo electric

Interference

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

Photodiode is used for wave nature of.

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Light

Thermal radiation

Radi waves

Sound waves

We can never accurately describes all aspects of sbatomic particles simulatanously. It is correct according to:

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Uncertainity Priciple

De-broglie Theory

Einstin Theory

Photo electric effect

The uncertainty principle was given by

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De-Broglie

Heisenberg

Einstein

Max Planck

In Compton effect the photon behaves as a.

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Wave

Particle

Nucleon

Both a and b

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

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Energy

Power

Acceleration

Angular momentum

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

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Threshold energy

Threshold frequency

Work function

Work ability

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

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Zero

Maximum

Minimum

infinity

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

Using relativistic effects the location of an air craft after an hour fight can be predicated about

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20 m

50 m

760 m

780 m

A block body is an ideal:

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Absorber

Radiator

Both a & b

None of above

Albert Einstein got noble prize for service in:

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Pair production

Annihilation of matter theory

Compton effect

Photoelectric effect

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

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