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A carnot engine, having efficiency of η = 1/10 as heat engine, is used as a refrigerator. If the work done on the system is 10J, Then find the amount of energy absorbed from the reservoir at lower temperature.

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As heat engine, let Q1 be the heat energy absorbed from the source and Q2 be the energy rejected to the sink. then

Q1 = W + Q2 = 10 + Q...... (1)

From equation (1) and (2)

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