Question # 1

Photo cells is a device which convert light into:

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Wave nature

Particle nature

Particle wave nature

Dual nature

Interference and diffraction confirm:

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Particle nature

Wave nature

Dual nature

None of these

The energy of photon of energy 1 eV is:

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1240 nm

1040 nm

1000 nm

620 nm

The unit of work function is

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eV

Volt

Farad

Herdz

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

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Energy

Momentum

Charge

Both (a) & (b)

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

Interference and diffraction of light confirms its:

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Particle nature

Dual nature

Wave nature

Electromagnetic nature

Moving photons posses:

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Energy

Momentum

Wavelength

All of these

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

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Electrons

Positrons

Photons

All of these

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 a photocell, certain metal emits electrons for :

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Visible light

Infrared light

Ultraviolet light

All of these

De-Broglie received the Nobel prize in

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1929

1937

1928

1924

The unit Compton wavelength is same as:

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Compton wavelength

Compton frequency

Compton shift

Both (a) & (b)

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

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

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

Photoelectric effect and Compton effect prove the:

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Wave nature of light

Particle nature of light

Dual nature of light

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

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)

Photo cells are used for :

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Security and counting system

Automatic door system

Automatic street lighting

All of these

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