Question # 1

The whole shape of the black body spectrum for all wavelengths was explained by the formula proposed by

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Max plank

Newton

Einstein

J.J. Thomson

When a platinum wire is heated, it appears orange red at

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500°C

900°C

1100°C

1300°C

the dilation of time applies to the timing processes which are:

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Physical

Chemical

Biological

All of these

None of these

When platinum wire is heated, it appears cherry red at

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1600°C

900°C

1100°C

1300°C

If a body reaches a speed equal to the speed of light, then its mass will became

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zero

very small

infinity

none of these

the symbol to be used in relativity problems denotes:

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Dilated time

Proper time

Life time

Half time

None of these

When monochromatic light is allowed to fall on cathode, it begins to emit electrons, these electrons are called

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thermoionic electrons

free electrons

photoelectrons

slow electrons

Which of the following phenomenon proves the particle nature of light

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interference

diffraction

photoelectric effect

none of these

Compton shift refers to:

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Photon

Meson

Proton

Positron

Both (B) and (D)

When a position comes close to an electron they annihilate into photons such that

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each photon has energy 0.51 Me v

each photon has energy 1.02 Me v

each photon has energy 0.25 Me v

none of these

The year when A.H. compton was awarded Nobel Prize is:

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1923

1927

1931

1935

None of these

Photoelectric effect takes place with a photon of:

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Very high energy

Very low energy

Low energy

High energy

None of these

The energy of a photon in a beam of infrared radiation of wavelength 1240 nm is

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100 ev

10⁶e v

10³e v

1.0 e v

Momentum is a parameter associated with

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wave motion

particle motion

neither wave nor particle motion

none of these

Current, voltage, resistance measuring circuit is connected with the galvanometer with the help of switch, known as

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ON switch

off switch

function switch

none of these

The general theory of relativity treats problems involving

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inertial frame of references

accelerating frame of references

both of these

none of these

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