A Carnot engine whose low temperature reservoir is at \( 7^{\circ} ...

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A Carnot engine whose low temperature reservoir is at \( 7^{\circ} \mathrm{C} \) has an efficiency of \( 50 \% \). It is desired to increase the efficiency to \( 70 \% \). By how many degrees should the temperature of the high temperature reservoir be increased
\( \mathrm{P} \)
[UPSEAT 2005; Similar Kerala PET 2007]
(a) \( 840 K \)
(b) \( 280 \mathrm{~K} \)
(c) \( 560 \mathrm{~K} \)
(d) \( 380 \mathrm{~K} \)
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