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The relation between pressure and temperature of a monoatomic gas in an adiabatic process is P prop T^(-C), where C = ____

Answer»

`2/5`
`5/2`
`3/5`
`5/3`

SOLUTION :The relation between pressure and temperature in an adiabatic process,
`P.T^(gamma/(1-gamma))` =constant
`therefore P prop T^((1-gamma)/gamma)`, comparing it with `P prop T^(-C)`
`therefore -C=(1-gamma)/gamma`
`therefore C=(gamma-1)/gamma`
For MONOATOMIC gas `gamma=5/3`
`therefore C=(5/3-1)/(5/3)=(2/3)/(5/3)`
`therefore C=2/5`


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