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Olympiad workbook

Exam: Olympiad workbook
Subject: NSEP
Chapter: Dual Nature of Matter

Olympiad workbook · NSEP · Dual Nature of Matter

A hydrogen atom ( M_ I I =1.67 × 10^ -23 ~kg ), initially at rest,...

A hydrogen atom (

M_{I I}=1.67 \times 10^{-23} \mathrm{~kg}

), initially at rest, emits a photon and goes from the excited state

n=5

to the ground state. The recoil speed of the atom is nearly

Options

A $4.2 \mathrm{~ms}^{-1}$
B $4 \times 10^{-4} \mathrm{~ms}^{-1}$
C $2 \times 10^{-2} \mathrm{~ms}^{-1}$
D $8 \times 10^2 \mathrm{~ms}^{-1}$

Correct answer

A. $4.2 \mathrm{~ms}^{-1}$

Step-by-step solution

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