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


bv = 2 ×× 10 ms-1


cv = 2 ×× 6 ms-1


d v = 2 ×× 106 ms-1



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


a5.53 x 10-36kg


b0 kg.


c2.46 x 10-36kg


d1.84 x 10-44kg


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


c0


dNone


View Answer p

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


aZero


bDouble


cHalf


d1


View Answer Double

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


a The maximum kinetic energy of the photoelectrons increases


bThe minimum kinetic energy of the photoelectrons decreases


cThe minimum kinetic energy of the photoelectrons increases


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


bRemains same


cBecomes half


dFirst increases then decrease because of the curvilinear graph


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


bDecreases because speed decreases


cRemains same


dIncreases then decrease


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


b Speed of sound


cSpeed of lightB.


dh


View Answer Speed of lightB.

Which one of the following has the largest energy content ?


a103 photons of wavelength 2 pm (γ-rays)


b102 photons of wavelength 1nm (x-rays)


c106 photons of wavelength 50?m (infrared)


d106 photons of wavelength 200nm (UV)



A photon is________________?


aA unit of energy


bA positively charged particle


cA quantum of electromagnetic radiation


dA unit of wavelength



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