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in Dual Nature of Radiation and Matter by (48.5k points)
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The momentum of a photon of energy 1 MeV in kg m/s will be

(a) 5 x 10-22 

(b) 0.33 x 106 

(c) 7 x 10-24 

(d) 10-22

1 Answer

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(a) 5 x 10-22

p= \(\frac{E}{c}\)\(\frac{1MeV}{3 \times 10^8\,ms^{-1}}\) = \(\frac{1.6 \times 10^{-13}J}{3 \times 10^8\,ms^{-1}}\) = 5.33 x 10-22 kg ms-1

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