A Carnot engine whose sink is at \( 300 \mathrm{~K} \) has an effic...

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A Carnot engine whose sink is at \( 300 \mathrm{~K} \) has an efficiency of \( 40 \% \). By how much should the
\( \mathrm{P} \) temperature of source be increased so as to increase

W) its efficiency by \( 50 \% \) of original efficiency?
(a) \( 380 \mathrm{~K} \)
(b) \( 275 \mathrm{~K} \)
(c) \( 325 \mathrm{~K} \)
(d) \( 250 \mathrm{~K} \)
(2006)
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