A hydrogen atom emits a photon corresponding to an electron transition from n = 5 to n = 1. The recoil speed of hydrogen atom is almost (mass of proton ≈ 1.6 x 10-27kg).
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a
10 ms-1
b
2 x 10-2 ms-1
c
4 ms-1
d
8 x 102 ms-1
answer is C.
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Detailed Solution
The Hydrogen atom before the transition was at rest. Therefore from conservation of momentum.⇒ v = 4.352 m/s ≈ 4 m/sec