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A Carnot engine whose low temperature re...

A Carnot engine whose low temperature reservoir is at `7^(@)C` has an efficiency of `50%`. It is desired to increase the efficiency to `70%` By low many degrees should the temperature of the high temperature reservoir be increased

A

840 k

B

280 k

C

560 k

D

380 k

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The correct Answer is:
D
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