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

A

`2 : 1 : sqrt(2)`

B

`2sqrt(2) : 1 : 2`

C

`sqrt(2) : 1 : 2`

D

`sqrt(2) : 2 : 1`

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