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  4. An ideal gas undergoes a reversible isothermal expansion from a state i to f . The change in entropy Δ S (i→ f) ) is

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Q. An ideal gas undergoes a reversible isothermal expansion from a state $i$ to $f$ . The change in entropy $ \Delta S\,(i\to f) $ ) is

AMUAMU 2012Thermodynamics

Solution:

Change in entropy $d S=\frac{d Q}{T}$ Entropy remains constant for reversible process $d S=0$