For a gas having $X$ degrees of freedom,what is the value of $\gamma$ (where $\gamma$ is the ratio of specific heats,$\gamma = C_{P} / C_{V}$)?

• A
  $\frac{1+X}{2}$
• B
  $1+\frac{X}{2}$
• C
  $1+\frac{2}{X}$
• D
  $1+\frac{1}{X}$