Question # 1

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

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)

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

Photo cells is a device which convert light into:

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Wave nature

Particle nature

Particle wave nature

Dual nature

The reverse process of photo-electric effect is called:

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Pair production

Compton effect

Annihilation of matter

X-rays

Compton Effect makes the use of the law of conservation of:

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Energy

Momentum

Charge

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

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

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Momentum

Angular momentum

Work

Torque

The minimum energy required by an electron to eject from metal surface is known as:

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Photo energy

Critical energy

Threshold energy

Work function

De-Broglie received the Nobel prize in

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1929

1937

1928

1924

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 unit of work function is

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eV

Volt

Farad

Herdz

Rest mass energy of electron is:

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1.02 MeV

0.51 MeV

931 MeV

200 MeV

Diffraction pattern has also been observed for:

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Proton

Neutron

Hydrogen atom

All of them

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

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

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

The energy of photon of energy 1 eV is:

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1240 nm

1040 nm

1000 nm

620 nm

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)

In photoelectric effect, electrons are emitted with:

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Same energy

Different energies

Both (a) & (b)

Intermittent energies

Interference and diffraction confirm:

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Particle nature

Wave nature

Dual nature

None of these

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

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54V

120V

220V

400V

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

Photoelectric effect and Compton effect prove the:

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Wave nature of light

Particle nature of light

Dual nature of light

Photo cells are used for :

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Security and counting system

Automatic door system

Automatic street lighting

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

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