Question # 1

In photoelectric effect, electrons are emitted:

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Slowly

Intermittently

Both (a) & (b)

Instantly

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

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)

Photoelectric effect and Compton effect prove the:

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Wave nature of light

Particle nature of light

Dual nature of light

Rest mass energy of electron is:

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1.02 MeV

0.51 MeV

931 MeV

200 MeV

Moving photons posses:

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Energy

Momentum

Wavelength

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 unit Compton wavelength is same as:

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Compton wavelength

Compton frequency

Compton shift

Both (a) & (b)

In a photocell, certain metal emits electrons for :

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Visible light

Infrared light

Ultraviolet light

All of these

The photoelectric effect was explained by:

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Einstein

Davison

Hertz

Planck

Potassium cathode in photocell emits electrons for a light:

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Visible

Infrared

Ultraviolet

X-rays

In photoelectric effect, if we increase the frequency of the incident light then of the electrons increased

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Number

K.E

P.E

Frequency

Joule-second is the unit of:

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Energy

Heat

Planck’s constant

None of these

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

Diffraction pattern has also been observed for:

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Proton

Neutron

Hydrogen atom

All of them

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

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

The energy of photon of energy 1 eV is:

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1240 nm

1040 nm

1000 nm

620 nm

Photo cells is a device which convert light into:

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Wave nature

Particle nature

Particle wave nature

Dual nature

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