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Q.

A heat engine has an efficiency η . Temperatures of source and sink are each decreased by 100K . Then, the efficiency of the engine

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a

Increases

b

Decreases

c

Remains constant

d

Becomes 1

answer is A.

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Detailed Solution

η=1-T2T1---(1) η'=1-T2-100T1-100---(2) from (1) and (2) we get η'>η
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A heat engine has an efficiency η . Temperatures of source and sink are each decreased by 100K . Then, the efficiency of the engine