The far infrared rotational absorption spectrum of a diatomic molecule shows...

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The far infrared rotational absorption spectrum of a diatomic molecule shows equidistant lines with spacing 20 cm^-1. The position of the first stokes line in the rotational Raman spectrum of this molecule is

A. 20 cm^-1

B. 40 cm^-1

C. 60 cm^-1

D. 120 cm^-1

Answer: Option C

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