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Efficiency of engine B, η = 1 − T2/T1.

1. Efficiency of engine B, η2 = 1 − T2/T
2. Here, η1 = η2
3. T/T1 = T2/T ⇒ T = √T1T2
4. Change in entropy is given by ΔS = dQ/T = ΔQ/T = mLf/T

Correct answer: Efficiency of engine B, η2 = 1 − T2/T

Solution

The efficiency of a heat engine is given by η = 1 − T2/T1, where T1 is the temperature of the source and T2 is the temperature of the sink. This matches option A.

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