p39_056 - 56. (a) and (b) The momenta of the electron and...

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56. (a) and (b) The momenta of the electron and the photon are the same: p = h λ = 6 . 63 × 10 34 J · s 0 . 20 × 10 9 m =3 . 3 × 10 24 kg · m / s . The kinetic energy of the electron is K e = p 2 2 m e = (3 . 3 × 10 24 kg · m / s) 2 2(9 . 11 × 10 31 kg) =6 . 0 × 10 18
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