In a Carnot heat engine, the temperature of source and sink are 500K and 375K respectively. The efficiency of engine is
A
75%
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B
25%
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C
33%
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D
−33%
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Solution
The correct option is B25% Temperature of source, T1=500K
Temperature of sink, T2=375K
Efficiency of Carnot heat engine, η=1−T2T1 ⇒η=1−375500 ∴η=0.25 or 25%