Q 11-11-020NEETJEE MainTop questionMedium
When a diatomic ideal gas is heated at constant pressure, the fraction of the heat supplied that increases its internal energy is
Answer: (C) $\dfrac{5}{7}$
Concept. At constant pressure $\dfrac{\Delta U}{Q} = \dfrac{C_V}{C_P} = \dfrac{1}{\gamma}$.
Step 1. Diatomic. $\gamma = \dfrac75$: fraction $\dfrac57$ (the rest, $\dfrac27$, is work).
Answer. $\dfrac57$ (Option C).
Solution by Sreeraj P, M.Sc Physics