If $C_p$ and $C_v$ denote the specific heats of nitrogen per unit mass at constant pressure and constant volume respectively,then
- A$C_p - C_v = \frac{R}{14}$
- B$C_p - C_v = R$
- C$C_p - C_v = 28R$
- D$C_p - C_v = \frac{R}{28}$
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