A carnot engine having an efficiency of 110 as heat engine, is used as a refrigerator. If the work done on the system is 10 J, the amount of energy absorbed from the reservoir at lower temperature is

The relation between coefficient of performance and efficiency of carnot engine is given asβ=1-ηη Given η=110,W=10 Jβ=1-110110=910·10=9 Since, β=Q2W, where Q2 is the amount of energy absorb from the reservor∴  Q2=βW=9×10=90 J