Question # 1

The reverse process of photo-electric effect is called:

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Pair production

Compton effect

Annihilation of matter

X-rays

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)

The maximum energy of the photoelectrons can be determined by making the:

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Anode positive

Anode negative

Cathode positive

Both (b) & (c)

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

Diffraction pattern has also been observed for:

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Proton

Neutron

Hydrogen atom

All of them

Potassium cathode in photocell emits electrons for a light:

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Visible

Infrared

Ultraviolet

X-rays

There is a certain frequency below which no electrons are emitted from the metal surface, this frequency is known as:

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Critical frequency

Threshold frequency

Maximum frequency

Minimum frequency

Interference and diffraction confirm:

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Particle nature

Wave nature

Dual nature

None of these

The dimensions of Planck’s constant “h” are same as that of:

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Momentum

Angular momentum

Work

Torque

In photoelectric effect, electrons are emitted:

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Slowly

Intermittently

Both (a) & (b)

Instantly

Davisson and Germer, in their experiment used:

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Nickle crystal

Lead crystal

Graphite crystal

Glass

The energy of photon of energy 1 eV is:

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1240 nm

1040 nm

1000 nm

620 nm

The energy of photon of wavelength 1240 nm is:

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0.5 eV

1.0 eV

1.5 eV

2.0 eV

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

G.P Thomson revealed:

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Particle nature of electron

Dual nature of electron

Wave nature of electron

Electromagnetic nature of electron

Photo cells is a device which convert light into:

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Wave nature

Particle nature

Particle wave nature

Dual nature

In order to increase the K.E of ejected photo electrons, there should be an increase in:

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Intensity of radiation

NoneI

Frequency of radiation

Both (b) & (c)

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

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54V

120V

220V

400V

Compton Effect makes the use of the law of conservation of:

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Energy

Momentum

Charge

Both (a) & (b)

In a photocell, sodium and potassium emit electrons for:

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Visible light

Infrared light

Ultraviolet light

All of these

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