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The kinetic energy of a photon of frequency $ϑ$ , rest mass $m_{o}$ , having mass m while moving with velocity v is

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12mv2

hϑ

mc2−m0c2

12mv2−hϑ

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Correct option is B

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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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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The kinetic energy of a photon of frequency $ϑ$ , rest mass $m_{o}$ , having mass m while moving with velocity v is