A refrigerator works between 4°C and 30°C. It is required to remove 600 calories of heat every second in order to keep the temperature of the refrigerated space constant. The power required is (Take, 1 cal = 4.2 Joules)
(b) Given temperature of source T=30°C=30+273 T1=303K
Temperature of sink T2=4°C=4+273 T2=277K
As we know that
where Q2 is the amount of heat drawn from the sink (at T2),W is workdone on working substance,
Q1 is amount of heat rejected to source (at room temperature ).