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[" A Carnot engine,whose sink is at "300...

[" A Carnot engine,whose sink is at "300K" ,has "],[" an efficiency of "40%" .By how much should the "],[" temperature of the source be increased so as "],[" to increase its efficiency by "50%" of its original "],[" efficiency? "],[" (a) "380K" (b) "275K" (c) "325K" (d) "250K]

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