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Thermodynamics — Physics STD 12 Science — Question

Maharashtra BoardEnglish MediumSTD 12 SciencePhysicsThermodynamics2 Marks
Question
In a refrigerator, in one cycle, the external work done on the working substance is $20 \%$ of the energy extracted from the cold reservoir. Find the coefficient of performance of the refrigerator.
✓

Answer

Data: $|W|=0.2\left|Q_c\right|$
The coefficient of performance of the refrigerator,
$ K =\left|\frac{Q_C}{W}\right|=\frac{\left|Q_C\right|}{0.2\left|Q_C\right|}$
$=5 $

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