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If T₁ = 1000 K and T₂ = 400 K, calculate the efficiency of the Carnot engine.

1. 0.4
2. 0.5
3. 0.6
4. 0.7

Correct answer: 0.6

Solution

The efficiency of a Carnot engine is given by η = 1 - (T₂/T₁). Substituting T₁ = 1000 K and T₂ = 400 K, η = 1 - (400/1000) = 1 - 0.4 = 0.6.

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