The efficiency of a Carnot engine working between 800 K and 500 K is

0.4

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0.625

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0.375

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0.5

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Solution

The correct option is C 0.375
$η = 1 - \frac{T_{2}}{T_{1}} = 1 - \frac{500}{800} = \frac{3}{8} = 0.375$

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