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A Carnot engine efficiency is equal to 1...

A Carnot engine efficiency is equal to `1/7`. If the temperature of the sink is reduced by 65 K , the efficiency becomes `1/4`. The temperature of the source and the sink in the first case are respectively

A

620 K, 520 K

B

520 K, 606.67 K

C

606.67K ,520K

D

520K , 610K

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The correct Answer is:
C
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