A gas has $n$ degrees of freedom. The ratio of specific heat of gas at constant volume to the specific heat of gas at constant pressure will be.
A$\frac{n}{n+2}$
B$\frac{ n +2}{ n }$
C$\frac{n}{2 n+2}$
D$\frac{ n }{ n -2}$
JEE MAIN 2022, Medium
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A$\frac{n}{n+2}$
a $C _{ v }=\frac{ nR }{2} \quad C _{ p }=\frac{( n +2) R }{2}$
$\frac{ C _{v}}{ C _{ p }}=\frac{ n }{ n +2}$
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