Q. The efficiency of Carnot’s engine operating between reservoirs, maintained at temperatures $27℃$ and $- 123℃$, is
A) 50%
B) 24%
C) 0.75%
D) 0.4%
Explanation
(a) $\eta = 1 - \frac{T_{2}}{T_{1}} = 1 - \frac{(273 - 123)}{(273 + 27)} = 1 - \frac{150}{300} = \frac{1}{2} = 50\%$
Reviewed by Dr. Abubacker
Physics Educator & NEET/JEE Specialist
Ph.D. in Physics with 19+ years of teaching experience.