A Carnot engine whose sink is at 300 K has anefficiency of 40%By how much should the temperatureof source be increased so as to increase - its efficiency by50% of original efficiency? [2006]

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A Carnot engine whose sink is at 300 K has anefficiency of 40%By how much should the temperatureof source be increased so as to increase - its efficiency by50% of original efficiency? [2006]