Question # 1

Photo cells is a device which convert light into:

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Wave nature

Particle nature

Particle wave nature

Dual nature

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

Interference and diffraction confirm:

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Particle nature

Wave nature

Dual nature

None of these

Moving photons posses:

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Energy

Momentum

Wavelength

All of these

G.P Thomson revealed:

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Particle nature of electron

Dual nature of electron

Wave nature of electron

Electromagnetic nature of electron

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 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

Photoelectric effect and Compton effect prove the:

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Wave nature of light

Particle nature of light

Dual nature of light

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 energy of photon of wavelength 1240 nm is:

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0.5 eV

1.0 eV

1.5 eV

2.0 eV

Diffraction pattern has also been observed for:

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Proton

Neutron

Hydrogen atom

All of them

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

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

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Energy

Momentum

Charge

Both (a) & (b)

Joule-second is the unit of:

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Energy

Heat

Planck’s constant

None of these

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 energy of photon of energy 1 eV is:

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1240 nm

1040 nm

1000 nm

620 nm

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 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

In photoelectric effect, electrons are emitted:

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Slowly

Intermittently

Both (a) & (b)

Instantly

The unit Compton wavelength is same as:

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Compton wavelength

Compton frequency

Compton shift

Both (a) & (b)

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

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Electrons

Positrons

Photons

All of these

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

Photo cells are used for :

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Security and counting system

Automatic door system

Automatic street lighting

All of these

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

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Momentum

Angular momentum

Work

Torque

Interference and diffraction of light confirms its:

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Particle nature

Dual nature

Wave nature

Electromagnetic nature

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

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54V

120V

220V

400V

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