Physics MCQs

Page No. 17

The velocity of a particle of mass m of de-Broglie wavelength λ is______________?


a v = 3 ×× 106 ms-1

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bv = 2 ×× 10 ms-1

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cv = 2 ×× 6 ms-1

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d v = 2 ×× 106 ms-1

✓



A photon of wavelength 900nm behaves like a particle of mass______________?


a5.53 x 10-36kg

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b0 kg.

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c2.46 x 10-36kg

✓


d1.84 x 10-44kg

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View Answer 2.46 x 10-36kg

If n number of the photon is striking on a metal surface then total momentum exerted is_______________?


ap

✓


b n

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c0

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dNone

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View Answer p

If a photon is reflected from the mirror then the change in momentum of each photon is_______________?


aZero

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bDouble

✓


cHalf

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d1

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View Answer Double

If the wavelength of incident radiation is increased in photoemission then_________________?


a The maximum kinetic energy of the photoelectrons increases

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bThe minimum kinetic energy of the photoelectrons decreases

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cThe minimum kinetic energy of the photoelectrons increases

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d The average kinetic energy of the photoelectrons decreases

✓



In a photoelectric effect monochromatic light is incident on a metal surface. If the incident light of twice the intensity but of same wavelength the kinetic energy of the emitted electron_______________?


aBecomes double

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bRemains same

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cBecomes half

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dFirst increases then decrease because of the curvilinear graph

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View Answer Remains same

After traveling through a vacuum a photon of light entering into some transparent denser medium. Thus the energy of light______________?


a Increases because wavelength decreases

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bDecreases because speed decreases

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cRemains same

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dIncreases then decrease

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View Answer Remains same

A transmitting station emits radio waves of wavelength λ at power P. If h is Planck’s constant & c the speed of light what is the rate of emission of photons ?


aλ

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b Speed of sound

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cSpeed of lightB.

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dh

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View Answer Speed of lightB.

Which one of the following has the largest energy content ?


a103 photons of wavelength 2 pm (γ-rays)

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b102 photons of wavelength 1nm (x-rays)

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c106 photons of wavelength 50?m (infrared)

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d106 photons of wavelength 200nm (UV)

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A photon is________________?


aA unit of energy

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bA positively charged particle

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cA quantum of electromagnetic radiation

✓


dA unit of wavelength

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