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For a diatomic gas the ratio of two specific heat Cp/Cv is equal to

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Degrees of freedom of diatomic gas, f = 5

C_{V}=\frac{fR}{2}=\frac{5R}{2}

C_{P}=\frac{(f+2)R}{2}=\frac{7R}{2}

\\\gamma =\frac{C_{P}}{C_{V}}\\ \gamma =\frac{\frac{7R}{2}}{\frac{5R}{2}}\\ \gamma =\frac{7}{5}\\ \gamma =1.4

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