The efficiency of an ideal heat engine working between 300 K and 400 K is

10%

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75%

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25%

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90%

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Solution

The correct option is C 25%
For ideal heat engine efficiency

$(%) η = (1 - \frac{T_{2}}{T_{1}}) \times 100$

$T_{2} = 300 K, T_{2} = 400 K η = (1 - \frac{T_{2}}{T_{1}}) \times 100 η = (1 - \frac{300}{400}) \times 100 = 25 %$

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