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The thermal efficiency of an air-standard Brayton cycle in terms of pressure ratio $r_p$ and $\gamma (= c_p /c_v)$ is given by

  1. $1-\dfrac{1}{{r_p}^{\gamma -1}} \\$
  2. $1-\dfrac{1}{{r_p}^{\gamma }} \\$
  3. $1-\dfrac{1}{{r_p}^{1/\gamma }} \\$
  4. $1-\dfrac{1}{{r_p}^{(\gamma -1)/\gamma }}$

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