First slide

Specific heat and degrees of freedom

Question

For a gas, $γ = \frac{9}{7}$ . What is the number of degrees of freedom of the molecules of this gas?

Easy

A

3
B

4
C

7
D

5

Solution

$\begin{array}{l} γ = 1 + \frac{2}{f} \\ \Rightarrow \frac{9}{7} = 1 + \frac{2}{f} \Rightarrow f = 7 \end{array}$

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