The correct relation between the degrees of freedom $f$ and the ratio of specific heat $\gamma$ is:

• Correct answer
  A

  $f=\frac{2}{\gamma -1}$
• B

  $f=\frac{2}{\gamma +1}$
• C

  $f=\frac{\gamma +1}{2}$
• D

  $f=\frac{1}{\gamma +1}$

Hence, the correct answer is option: 'A'.