For the reversible isothermal change of an ideal gas undergoing a process, the change in entropy is

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For the reversible isothermal change of an ideal gas undergoing a process, the change in entropy is given by

(a) \((\Delta S)_{T}=R \ln \frac{V_{1}}{V_{2}}\)

(b) \((\Delta S)_{T}=R \ln \frac{P_{1}}{P_{2}}\)

(c) \((\Delta S)_{T}=R \ln \frac{P_{2}}{P_{1}}\)

(d) None of these.

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