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A ideal heat engine exhausting heat at $77^{0} C$ is to have a 30% efficiency. It must take heat at

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2270C

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detailed solution

Correct option is B

η=1−T2T1 30100=1-350T1 T1=500K=500-273=227°C

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A ideal heat engine exhausting heat at 770C is to have a 30% efficiency. It must take heat at

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A ideal heat engine exhausting heat at $77^{0} C$ is to have a 30% efficiency. It must take heat at