Question # 1

Rest mass energy of electron is:

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1.02 MeV

0.51 MeV

931 MeV

200 MeV

The maximum kinetic energy of emitted photoelectrons depends upon:

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The intensity of incident light

Frequency of incident light

Metal surface

Both frequency of incident light and metal surface

In photoelectric effect, electrons are emitted:

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Slowly

Intermittently

Both (a) & (b)

Instantly

Joule-second is the unit of:

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Energy

Heat

Planck’s constant

None of these

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 a photocell, certain metal emits electrons for :

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Visible light

Infrared light

Ultraviolet light

All of these

Moving photons posses:

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Energy

Momentum

Wavelength

All of these

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

A human eye can detect the electromagnetic radiations of the type:

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Infrared radiations

For- infrared radiations

X-rays radiations

Red radiations

The stopping potential for a certain metal is 10 volt, the max. Energy of emitted electron is:

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10 J

100 J

1.6 × 10-18 J

1.6 × 10-19 J

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

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54V

120V

220V

400V

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 a photocell, cesium coated oxidized silver emits electrons for :

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Visible light

Infrared light

Ultraviolet light

All of these

A human eye can detect the electromagnetic radiations of the type:

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Infrared radiations

For- infrared radiations

X-rays radiations

Red radiations

The photoelectric effect was explained by:

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Einstein

Davison

Hertz

Planck

In photoelectric effect, electrons are emitted with:

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Same energy

Different energies

Both (a) & (b)

Intermittent energies

The unit of work function is

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eV

Volt

Farad

Herdz

A photo cell is based on:

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Compton effect

Pair production

Photo cell

All of these

The energy of photon of energy 1 eV is:

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1240 nm

1040 nm

1000 nm

620 nm

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

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