I got this question for a quiz in class, and I believed that the entropy change can't be zero because for it to be zero, the process should be reversible and adiabatic. So since there was no option I marked none of the above. (See attached image)
But prof. marked it as wrong. So now, I am confused.
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1$\begingroup$ Of course you are correct. The process must also be reversible, and not just adiabatic. $\endgroup$– Chet MillerCommented Feb 17, 2018 at 16:23
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$\begingroup$ What Chester wrote... For an irreversible process, $dS>T\delta Q$, so if the process is also adiabatic $dS>0$. $\endgroup$– valerioCommented Feb 17, 2018 at 16:37
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1 Answer
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The correct answer is zero. In adiabatic process energy is transferred to its surrounding only as work.
