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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

`Delta S = nRT "In" ((P_f)/( P_i))`

B

`Delta S = RT "In" ((P_i)/( P_f))`

C

`Delta S = nR "In" ((P_f)/( P_i))`

D

`Delta S= nR "In" ((P_i)/( P_f))`

Text Solution

Verified by Experts

The correct Answer is:
D
`Delta S = nc "In" (T_i)/( T_f) + nR "In" (P_i)/( P_f)`
For isothermal `T_i = T_f, "In" 1=0`
`therefore Delta S = nR "In" (P_i)/( P_f)`
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