Q107 · CSIR-NET Chemistry, December 2015

Paper: CSIR-NET December 2015 · Subject: Physical Chemistry · Chapter: Molecular Spectroscopy · Topic: Molecular Spectroscopy – General · Marks: 2 · Difficulty: Medium

If the reduced mass of a diatomic molecule is doubled without changing its force constant, the vibrational frequency of the molecule will be
(a)$\sqrt{2}$ times the original frequency
(b)$1 / \sqrt{2}$ times the vibrational frequency
(c)twice the original frequency
(d)unchanged
Answer
Answer: B ✓ checked by 4AB · confidence high
Explanation
ν = (1/2π)√(k/μ): doubling μ divides the frequency by √2.

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