Q 11-11-029NEETJEE MainEasy
A refrigerator works between $-3°$C and $27°$C. Its maximum possible coefficient of performance is
Answer: (D) $9$
Concept. Ideal (Carnot) refrigerator: $\beta = \dfrac{T_2}{T_1 - T_2}$.
Step 1. Substitute. $\dfrac{270}{30} = 9$.
Answer. $9$ (Option D).
Solution by Sreeraj P, M.Sc Physics