Q 11-12-047JEE MainJEE Main 2024 (6 Apr, Shift 2)Easy
The energy of 10 non-rigid diatomic molecules at temperature $T$ is
Answer: (B) $35\,k_BT$
A non-rigid diatomic molecule has 3 translational, 2 rotational and 1 vibrational mode (the vibration counts twice: kinetic and potential), i.e. 7 terms of $\dfrac12k_BT$.
$$E = 10\times\frac72k_BT = 35\,k_BT$$
Solution by Sreeraj P, M.Sc Physics