Q.

The kinetic energy of a photon of frequency ϑ, rest mass  mo, having mass m while moving with velocity v is

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a

12mv2

b

hϑ

c

mc2−m0c2

d

12mv2−hϑ

answer is B.

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Detailed Solution

The total energy of photon is its kinetic energy, as rest mass energy of a photon is zero. As total energy of a photon=hϑ .  Therefore the kinetic energy of a photon is equal to total energy rest mass energy =hϑ−0=hϑ
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