Question # 1

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

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54V

120V

220V

400V

In photoelectric effect, electrons are emitted:

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Slowly

Intermittently

Both (a) & (b)

Instantly

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 photoelectric effect, electrons are emitted with:

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Same energy

Different energies

Both (a) & (b)

Intermittent energies

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

Diffraction pattern has also been observed for:

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Proton

Neutron

Hydrogen atom

All of them

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 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)

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 wavelength 1240 nm is:

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0.5 eV

1.0 eV

1.5 eV

2.0 eV

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

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Visible light

Infrared light

Ultraviolet light

All of these

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 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

Moving photons posses:

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Energy

Momentum

Wavelength

All of these

Joule-second is the unit of:

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Energy

Heat

Planck’s constant

None of these

De-Broglie received the Nobel prize in

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1929

1937

1928

1924

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

The reverse process of photo-electric effect is called:

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Pair production

Compton effect

Annihilation of matter

X-rays

De-Broglie received the Nobel prize on his work on:

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Wave nature of particle

Corpuscular nature of wave

Dual nature of particle

All of them

Potassium cathode in photocell emits electrons for a light:

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Visible

Infrared

Ultraviolet

X-rays

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