A Carnot's engine used first an ideal monoatomic gas then an ideal diatomic gas. If the source and sink temperature are ${411^o}C$ and ${69^o}C$ respectively and the engine extracts $1000\, J $ of heat in each cycle, then area enclosed by the $PV$ diagram is ........ $J$
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(c) $\eta = 1 - \frac{{{T_2}}}{{{T_1}}} = 1 - \frac{{(273 + 69)}}{{(273 + 411)}} = 0.5$
==> Work done$ = \eta \times Q = 0.5 \times 1000 = 500\,J$
==> Work done$ = \eta \times Q = 0.5 \times 1000 = 500\,J$
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