If the degree of freedom of a gas is $f,$ then the ratio of two specific heats ${C_P}/{C_V}$ is given by

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

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