The efficiency of an ideal heat engine working between the freezing point and boiling point of water, is?

6.25 %

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26.8 %

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12.5 %

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20 %

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Solution

The correct option is B $26.8 %$
$η_{h e a t e n g i n e} = 1 - \frac{Q_{c}}{Q_{h}} = 1 - \frac{T_{c}}{T_{h}} = 1 - \frac{273}{373} \times 100$
$η = 26.80$
option 2 is correct answer

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