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Physics · PYQ NEET UG 2017
हिन्दीA Carnot engine having an efficiency of \( \frac{1}{10} \) as heat engine, is used as a refrigerator. If the work done on the system is \( 10\text{ J} \), the amount of energy absorbed from the reservoir at lower temperature is:
Correct answer · Option 2
\( 90\text{ J} \)
Explanation
Coefficient of performance \( \beta = \frac{1 - \eta}{\eta} = \frac{1 - 1/10}{1/10} = 9 \). Also \( \beta = \frac{Q_2}{W} \implies Q_2 = \beta \times W = 9 \times 10 = 90\text{ J} \).
