The molar specific heat at constant pressure of an ideal gas is $(7/2)R.$ The ratio of specific heat at constant pressure to that at constant volume is
A$9/7$
B$7/5$
C$8/7$
D$5/7$
AIPMT 2006, Medium
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B$7/5$
b Molar specific heat at constant pressure
${C_p} = \frac{7}{2}R$
$\therefore {C_V} = {C_P} - R = \frac{7}{2}R - R = \frac{5}{2}R.$
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