Question # 1

Interference and diffraction confirm:

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Particle nature

Wave nature

Dual nature

None of these

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

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

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54V

120V

220V

400V

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

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Electrons

Positrons

Photons

All of these

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 unit of work function is

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eV

Volt

Farad

Herdz

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

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

Davisson and Germer, in their experiment used:

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Nickle crystal

Lead crystal

Graphite crystal

Glass

In a photocell, certain metal emits electrons for :

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Visible light

Infrared light

Ultraviolet light

All of these

Interference and diffraction of light confirms its:

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Particle nature

Dual nature

Wave nature

Electromagnetic nature

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

A photo cell is based on:

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Compton effect

Pair production

Photo cell

All of these

Photo cells are used for :

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Security and counting system

Automatic door system

Automatic street lighting

All of these

The energy of photon of energy 1 eV is:

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1240 nm

1040 nm

1000 nm

620 nm

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

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 stopping potential for a certain metal is 10 volt, the max. Energy of emitted electron is:

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10 J

100 J

1.6 × 10-18 J

1.6 × 10-19 J

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)

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