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Thermal Expansion and Gas Properties

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Multiple Choice

At constant pressure how much fraction of heat supplied to gas is converted into mechanical work ?  

  1. $\dfrac { \gamma -1 }{ \gamma } $
  2. $\dfrac { \gamma }{ \gamma -1 } $
  3. $\gamma -1$
  4. $\dfrac { \gamma }{ \gamma +1 } $