If \( \mathrm{C}_{\mathrm{p}} \) and \( \mathrm{C}_{\mathrm{v}} \) ...

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If \( \mathrm{C}_{\mathrm{p}} \) and \( \mathrm{C}_{\mathrm{v}} \) denote the specific heats of nitrogen per unit mass at constant pressure and constant volume respectively, then :-
(A) \( \mathrm{C}_{\mathrm{p}}-\mathrm{C}_{\mathrm{v}}=\mathrm{R} / 28 \)
(B) \( \mathrm{C}_{\mathrm{p}}-\mathrm{C}_{\mathrm{v}}=\mathrm{R} / 4 \)
(C) \( \mathrm{C}_{\mathrm{p}}-\mathrm{C}_{\mathrm{v}}=\mathrm{R} \)
(D) \( \mathrm{C}_{\mathrm{p}}-\mathrm{C}_{\mathrm{v}}=28 \mathrm{R} \)
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