29the answer shud be A
during the transition n = 5 to n = 1 energy released = hc/λ
and momentum of a photon = h/λ
so by balancing linear momentum
mv = h/λ where m is the mass of hydrogen atom 1.6 * 10-19
and h/λ = 13.06 * 1.6 10-19 / 3 * 108
When a hydrogen atom emits a photon during the transition n = 5 to n = 1, its recoil speed is approximately
(a) 4 m/s
(b) 800 m/s
(c) 3 mm/s
(d) 0.1 mm/s
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