A) 5/7
B) 2/7
C) 3/5
D) 3/4
Correct Answer: B
Solution :
Specific heat at constant pressure for diatomic gas \[\begin{align} & {{C}_{P}}=\frac{7}{2}R \\ & \frac{R}{{{C}_{P}}}=\frac{2}{7} \\ \end{align}\]
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