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The rest mass of the photon is...

The rest mass of the photon is

A

`9 xx 10^(-31)` kg

B

`1.76 xx 10^(-35)` kg

C

zero

D

one a.m.u

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The correct Answer is:
C
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Which of the following is correct regarding photons? (i) A photon always travels at a speed 3xx10^(8)m//sec in vacuum. (ii) The rest mass of photon is zero. (iii) Let E and p be the energy and linear momentum of a photon and v and lambda be the frequency and wavelength of the same light when it behaves as a wave. Then E=h v =(hc)/(lambda) p=(h v)/(c) =(h)/(lambda) =(E)/(c) (iv) A photon may collide with a meterial particle. The total energy and the total momentum remain conserved in such a collision. The photon may get absorbed and / or a new photon may be emitted. Thus, the number of photons may not be consverved.

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NIKITA PUBLICATION-ELECTRONS AND PHOTONS -MCQs
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