The efficiency of Carnot's engine operating between reservoirs, maintained at temperatures ${27^o}C$ and $ - {123^o}C,$ is ...... $\%$
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(a)$\eta = 1 - \frac{{{T_2}}}{{{T_1}}} = 1 - \frac{{(273 + 123)}}{{(273 + 27)}} = 1 - \frac{{150}}{{300}} = \frac{1}{2} = 50\% $
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