If the degrees of freedom of a gas molecule be f, then the ratio of two specific heat capacities $\frac{C_{P}}{C_{V}}$ is given by

\frac{2}{f} + 1

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1 - \frac{2}{f}

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1 + \frac{1}{f}

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1 - \frac{1}{f}

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Solution

The correct option is A $\frac{2}{f} + 1$
$η = \frac{C_{P}}{C_{V}} = 1 + \frac{2}{n} = 1 + \frac{2}{f}$

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