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Atomic and Molecular Physics Question on atom structure models

The mean distance between the two atoms of an HD molecule is rr, where H and D denote hydrogen and deuterium, respectively. The mass of the hydrogen atom is mHm_H. The energy difference between the two lowest lying rotational states of HD in multiples of h2mHr2\frac{h^2}{m_H r^2} is:

A

32\frac{3}{2}

B

23\frac{2}{3}

C

6

D

43\frac{4}{3}

Answer

32\frac{3}{2}

Explanation

Solution

The correct option is (A) : 43\frac{4}{3}