Question

The inside and outside temperature of a refrigerator are 273K and 303K respectively. Assuming that refrigerator cycle is reversible, for every joule of work done, the heat delivered to the surrounding will be?

(a) 10 J

(b) 20 J

(c) 30 J

(d) 50 J

I have been asked this question in unit test.

I'd like to ask this question from Thermodynamics topic in portion Kinetic Theory of Gases of Engineering Physics I

Answer 1

The correct choice is (a) 10 J

To explain: β=Q2/W=T2/(T1-T2 )=273/(303-273)

Q2=273W/30=273/30×1J=9J

Q1=Q2+W=9+1=10J.