Kinetic Theory - Result Question 31
31. 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) $8 / 7$
(b) $5 / 7$
(c) $9 / 7$
(d) $7 / 5$
[2006]
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Answer:
Correct Answer: 31. (d)
Solution:
(d) $C_P=\frac{7}{2} R ; C_V=C_P-R=\frac{7}{2} R-R=\frac{5}{2} R$
$\frac{C_P}{C_V}=\frac{7 / 2 R}{5 / 2 R}=\frac{7}{5}$
