Q: A diatomic is made of two masses m1 and m2 which are separated by a distance r. If we calculate its rotational energy by applying Bohr’s rule of angular momentum quantization, its energy will be given by (n is an integer)

(a) $ \frac{(m_1 + m_2)^2 n^2 h^2}{2m_1^2 m_2^2 r^2} $

(b) $ \frac{n^2 h^2}{2 (m_1 + m_2) r^2} $

(c) $ \frac{ 2 n^2 h^2}{ (m_1 + m_2) r^2} $

(d) $ \frac{(m_1 + m_2) n^2 h^2}{2 m_1 m_2 r^2} $

Ans: (d)