Question

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
(a) 10⁻4 ms⁻¹ (b) 2 × 10⁻² ms⁻¹
(c) 4 ms⁻¹ (d) 8 × 10² ms⁻¹

Answer 1

Answer:

A is the right answer.

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Answer 2

A is the answer.

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