The efficiency of an ideal heat engine working between the freezing point and boiling point of water, is

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26.8 %

20 %

6.25 %

12.5 %

answer is A.

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Detailed Solution

Efficiency of an ideal heat engine,η=1-T2T1 Freezing point of water =0°C=273 K Boiling point of water =100°C=(100+273)K=373 KT2: Sink temperature =273 KT1: Source temperature =373 K%η=1-T2T1×100=1-273373×100=100373×100=26.8%

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