Question # 1

J.J Thomson finds:

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Particle nature of the electron

Dual nature of electron

Wave nature of electron

Electromagnetic nature of electron

Davisson and Germer, in their experiment used:

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Nickle crystal

Lead crystal

Graphite crystal

Glass

In order to perform experiment, Davisson and Germer used accelerating voltage of:

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54V

120V

220V

400V

The unit of work function is

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eV

Volt

Farad

Herdz

Interference and diffraction confirm:

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Particle nature

Wave nature

Dual nature

None of these

In a photocell, cesium coated oxidized silver emits electrons for :

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Visible light

Infrared light

Ultraviolet light

All of these

De-Broglie received the Nobel prize in

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1929

1937

1928

1924

De-Broglie received the Nobel prize on his work on:

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Wave nature of particle

Corpuscular nature of wave

Dual nature of particle

All of them

Photo cells is a device which convert light into:

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Wave nature

Particle nature

Particle wave nature

Dual nature

The minimum energy required by an electron to eject from metal surface is known as:

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Photo energy

Critical energy

Threshold energy

Work function

The energy of photon of wavelength 620 nm is:

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0.5 eV

1.0 eV

1.5 eV

2.0 eV

In photoelectric effect, electrons are emitted:

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Slowly

Intermittently

Both (a) & (b)

Instantly

Davisson and Germer received the Nobel prize for their work on:

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Wave nature of particle

Corpuscular nature of wave

Dual nature of particle

All of them

The maximum energy of the photoelectrons depends upon:

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Frequency of incident light

Intensity of incident light

Nature of metal

Both (a) & (c)

A photo cell is based on:

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Compton effect

Pair production

Photo cell

All of these

The number of electrons emitted depend upon

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Colour of target surface

Shape of surface

Frequency of incident light

Intensity of incident light

In photoelectric effect, electrons are emitted with:

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Same energy

Different energies

Both (a) & (b)

Intermittent energies

The energy of photon of energy 1 eV is:

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1240 nm

1040 nm

1000 nm

620 nm

In Compton effect, it was considered that X-rays consist of:

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Electrons

Positrons

Photons

All of these

G.P Thomson revealed:

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Particle nature of electron

Dual nature of electron

Wave nature of electron

Electromagnetic nature of electron

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