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The relation between internal energy U, ...

The relation between internal energy `U`, pressure `P` and volume `V` of a gas in an adiabatic process is
`U = a + bPV` where a and b are constants. What is the effective value of adiabatic constant `gamma` ?

A

`(b+1)/(b)`

B

`(b+1)/(a)`

C

`(a+1)/(b)`

D

`(a)/(a+b)`

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