A Carnot refrigerator operates between a cold reservoir at and a hot reservoir at

PHYSICS · Single correct · A Level · Physics · Engineering physics · Engineering physics

Problem

A Carnot refrigerator operates between a cold reservoir at

270\,\text{K}

and a hot reservoir at

300\,\text{K}

. When the same device is used as a heat pump between these two reservoirs, its coefficient of performance is (a)

9

(b)

10

(c)

8

(d)

12