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An ideal gas is compressed isothermall...

An ideal gas is compressed isothermally unit its pressure is doubled and then allowed to expand adiabatically to regain its original volume ` (gamma =1.4 and 2 ^(-1.4) = 0.38) ` The ratio of the final to initial pressure is

A

` 0. 76 : 1`

B

` 1: 1`

C

` 0. 66 : 1`

D

` 0. 86 : 1`

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