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An ideal gas with pressure P, volume V a...

An ideal gas with pressure P, volume V and temperature T is expanded isothermally to a volume 2V and a final pressure `P_1` . The same gas is expanded adiabatically to a volume 2V, the final pressure is `P_A`. In terms of the ratio of the two specific heats for the gas `gamma` , the ratio `P_I//P_A` is :

A

`2^(gamma - 1)`

B

`2^(1-gamma)`

C

`2^gamma`

D

`2gamma`

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The correct Answer is:
A
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