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If T₁ = 400 K and T₂ = 300 K, calculate the efficiency of the Carnot engine.

1. 25%
2. 30%
3. 35%
4. 40%

Correct answer: 25%

Solution

The efficiency of a Carnot engine is given by η = 1 - (T₂/T₁). Substituting T₁ = 400 K and T₂ = 300 K, η = 1 - (300/400) = 1 - 0.75 = 0.25 or 25%.

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