For the electron

K = (1/2)mv2 = p2/2m (since p = mv)

Therefore p = (2mK)1/2

l = h/p = h/(2mK)1/2 = (6.63X10-34Js)/[(2)(9.11X10-31 kg)(6.0X1021 J)]

= 6.34X10-9 m
 

For the photon

E = hc/ = (6.63X10-34Js)(3.0X108 m/s)/6.34X10-9 m = 3.14X10-17 J

Answer is D

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