Q. 33

Expert-verified
Found in: Page 596

### Physics for Scientists and Engineers: A Strategic Approach with Modern Physics

Book edition 4th
Author(s) Randall D. Knight
Pages 1240 pages
ISBN 9780133942651

# The coefficient of performance of a refrigerator is. The compressor usesof energy per cycle.a. How much heat energy is exhausted per cycleb. If the hot-reservoir temperature is, what is the lowest possible temperature inof the cold reservoir?

a.Heat energy is exhausted per cycle is.

b.Lowest possible temperatureis.

See the step by step solution

## Step 1: Calculation for heat energy is exhausted per cycle  (part a)

a.

As a result of the first law that was applied to refrigerators, we now have

Substituting this we get,

## Step 2: Calculation for lowest possible temperature (part b)

b.

When the coefficient of performance is that of a Carnot refrigerator, the lowest value of the temperature of the cold reservoir is reached.

That is,

The value of the lower temperature can be separated as follows:

The minimum temperature ,