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Diatomic gas is used in carnot heat engine. If efficiency of given carnot heat engine is $80\%$ , then find the ratio of initial volume to final volume of gas during adiabatic expansion
  • A${\left( {\frac{1}{5}} \right)^{\frac{3}{2}}}$
  • B${\left( {\frac{1}{3}} \right)^{\frac{5}{2}}}$
  • C${\left( {\frac{1}{5}} \right)^{\frac{5}{2}}}$
  • D${\left( {\frac{1}{5}} \right)^{\frac{2}{5}}}$
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