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Internal Energy

A heat engine...

Question

A heat engine converts 40% of the heat absorbed into mechanical work. If temperature of the source is $127^{o} C$ then that of the sink

260K

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240K

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280K

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300K

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Solution

The correct option is B 240K
For Carnot engine,
efficiency= $η = 1 - \frac{T_{2}}{T_{1}} = 0.4$ ,
where $T_{2}$ =sink temperature, $T_{1}$ =source temperature
Thus, Sink temperature= $0.6 \times 400 K = 240 K$

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