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) $\dfrac{5}{7}$
$$\frac{\Delta U}{Q} = \frac{nC_V\Delta T}{nC_P\Delta T} = \frac{1}{\gamma} = \frac{5}{7}$$
(The remaining $\dfrac{2}{7}$ goes into work.)
Solution by Sreeraj P, M.Sc Physics