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Question: Momentum of a photon is equal to that of an electron having kinetic energy 3 MeV. Energy of the phot...

Momentum of a photon is equal to that of an electron having kinetic energy 3 MeV. Energy of the photon is –

A

3.47 MeV

B

13.7 MeV

C

23.4 MeV

D

34.7 MeV

Answer

3.47 MeV

Explanation

Solution

E2 = (pec)2 + E02\mathrm { E } _ { 0 } ^ { 2 }

(3 MeV + 0.511 MeV)2

= (pec)2 + (0.511 MeV)2

⇒ pec = 3.47 MeV = p.c