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Three samples of the same gas A, B and C...

Three samples of the same gas A, B and C `(gamma=3//2)` have equal volume initially. Now, the volume of each sample is doubled. For A, the process is adiabatic, for B, it is isobaric and for C, the process is isothermal. If the final pressures are equal for all the three samples, the ratio of their initial pressures is

A

`2:1`

B

`1:1:1`

C

`1:2:1`

D

`1:1:2`

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The correct Answer is:
B
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