Question # 1

The unit Compton wavelength is same as:

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Compton wavelength

Compton frequency

Compton shift

Both (a) & (b)

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

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

G.P Thomson revealed:

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Particle nature of electron

Dual nature of electron

Wave nature of electron

Electromagnetic nature of electron

The energy of photon of energy 1 eV is:

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1240 nm

1040 nm

1000 nm

620 nm

A.H Compton studied the scattering of X-rays by loosely bound electrons from a graph target in:

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1905

1911

19251

1923

Davisson and Germer, in their experiment used:

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Nickle crystal

Lead crystal

Graphite crystal

Glass

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

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Momentum

Angular momentum

Work

Torque

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

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

Potassium cathode in photocell emits electrons for a light:

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Visible

Infrared

Ultraviolet

X-rays

Moving photons posses:

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Energy

Momentum

Wavelength

All of these

The reverse process of photo-electric effect is called:

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Pair production

Compton effect

Annihilation of matter

X-rays

A photo cell is based on:

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Compton effect

Pair production

Photo cell

All of these

The unit of work function is

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eV

Volt

Farad

Herdz

In a photocell, certain metal emits electrons for :

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Visible light

Infrared light

Ultraviolet light

All of these

Photoelectric effect and Compton effect prove the:

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Wave nature of light

Particle nature of light

Dual nature of light

In photoelectric effect, electrons are emitted:

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Slowly

Intermittently

Both (a) & (b)

Instantly

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)

Which of the particles, electron, proton and neutron moving with same speed has longest wave length?

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Electron

Proton

Neutron

All have same

Photo cells are used for :

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Security and counting system

Automatic door system

Automatic street lighting

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

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54V

120V

220V

400V

Rest mass energy of electron is:

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1.02 MeV

0.51 MeV

931 MeV

200 MeV

Photo cells is a device which convert light into:

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Wave nature

Particle nature

Particle wave nature

Dual nature

Diffraction pattern has also been observed for:

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Proton

Neutron

Hydrogen atom

All of them

In a photocell, sodium and potassium emit electrons for:

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Visible light

Infrared light

Ultraviolet light

All of these

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

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