If the temperature of sink is at absolute zero, then the efficiency of Carnot engine will be ........ $\%$
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(b)
The efficiency of the cycle is given as $\eta=1-\frac{T_2}{T_1}$. Here $T_1$ is the temperature of the source and $T_2$ is the temperature of the sink. If $T_2=0$ we get efficiency as $\eta$ as $100 \%$.
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