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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