Q 11-11-009JEE MainAIEEE 2007Easy
If $c_P$ and $c_V$ denote the specific heats of nitrogen per unit mass at constant pressure and constant volume respectively, then
Answer: (A) $c_P - c_V = \dfrac{R}{28}$
Mayer's relation per mole: $C_P - C_V = R$. Per unit mass, divide by the molar mass ($M = 28$ for N$_2$):
$$c_P - c_V = \frac{R}{28}$$
Solution by Sreeraj P, M.Sc Physics