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A refrigerator whose coefficient of perf...

A refrigerator whose coefficient of performance `eta'` is 4, extracts heat from the cooling compartment at the rate of 400 J per cycle.
(a) How much work per cycle is required to operate the refrigerator cycle?
(b) How much heat per cycle is discharged to the room which acts as the high temperature reservoir?

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The correct Answer is:
50 J , 300 J
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