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For a sample of perfect gas when its pre...

For a sample of perfect gas when its pressure is changed isothermally from `p_(i)` to `p_(f)` , the entropy change is given by

A

`DeltaS = nRT In ((P_(l))/(P_(i)))`

B

`DeltaS = nRT In ((P_(i))/(P_(l)))`

C

`DeltaS = nR In ((P_(l))/(P_(i)))`

D

`DeltaS = nR In ((P_(i))/(P_(l)))`

Text Solution

Verified by Experts

The correct Answer is:
D
`DeltaS = nRln (P_(i))/(P_(f))+ nCP ln (T_(i))/(T_(f))`
For isothermal process `T_(i)= T_(f)= 0`
`:. DeltaS= nR ln (P_(i))/(P_(f))`
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