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We know that efficiency of Carnot engine η = 1 - T₂/T₁. If T₁ = 500 K and T₂ = 400 K, calculate the efficiency.

1. 0.2
2. 0.25
3. 0.3
4. 0.5

Correct answer: 0.25

Solution

The efficiency of a Carnot engine is given by η = 1 - T₂/T₁. Substituting T₁ = 500 K and T₂ = 400 K, we get η = 1 - 400/500 = 1 - 0.8 = 0.2. Hence, the efficiency is 0.2 or 20%.

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