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) $c_P - c_V = \dfrac{R}{28}$
Concept. Per mole, $C_P-C_V=R$ (Mayer's relation). Specific heats per unit mass are molar values divided by the molar mass $M$, so $c_P-c_V=\dfrac RM$.
Step 1. Molar mass of nitrogen. $N_2$: $M=28$.
Answer. $c_P-c_V=\dfrac{R}{28}$ (Option A).
Solution by Sreeraj P, M.Sc Physics
