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Q.3 If a photon of energy E, collides at an angle 0 with another photon of energy E2, prove that the threshold energy for

Q.3 If a photon of energy E, collides at an angle 0 with another photon of energy E2, prove that the threshold energy for first photon, (E1)th; required for the formation of a pair of particles of mass m is given by 2m?c4 (E1)th = E2(1 cos 0)

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