In the case of diatomic gas, the heat given at constant pressure is that part of energy which is used for the expansion of gas, is
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(c) $\Delta W = $energy used for expansion $ = PdV = RdT$
$\Delta Q = $heat supplied to diatomic gas at constant $P$
$\therefore \;\frac{{\Delta W}}{{\Delta Q}} = \frac{{RdT}}{{\frac{7}{2}RdT}} = \frac{2}{7}$
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