Question # 1

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

The unit Compton wavelength is same as:

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Compton wavelength

Compton frequency

Compton shift

Both (a) & (b)

Interference and diffraction confirm:

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Particle nature

Wave nature

Dual nature

None of these

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

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

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Visible light

Infrared light

Ultraviolet light

All of these

The maximum kinetic energy of emitted photoelectrons depends upon:

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The intensity of incident light

Frequency of the incident light

Temperature of the surface

All of above

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

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Momentum

Angular momentum

Work

Torque

The energy of photon of energy 1 eV is:

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1240 nm

1040 nm

1000 nm

620 nm

Photo cells are used for :

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Security and counting system

Automatic door system

Automatic street lighting

All of these

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

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

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54V

120V

220V

400V

Photo cells is a device which convert light into:

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Wave nature

Particle nature

Particle wave nature

Dual nature

The unit of work function is

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eV

Volt

Farad

Herdz

The photoelectric effect was explained by:

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Einstein

Davison

Hertz

Planck

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

Joule-second is the unit of:

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Energy

Heat

Planck’s constant

None of these

In photoelectric effect, electrons are emitted with:

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Same energy

Different energies

Both (a) & (b)

Intermittent energies

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

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Electrons

Positrons

Photons

All of these

Interference and diffraction of light confirms its:

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Particle nature

Dual nature

Wave nature

Electromagnetic nature

In a photocell, sodium and potassium emit electrons for:

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Visible light

Infrared light

Ultraviolet light

All 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

Photoelectric effect and Compton effect prove the:

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Wave nature of light

Particle nature of light

Dual nature of light

De-Broglie received the Nobel prize in

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1929

1937

1928

1924

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 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 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

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