JEE Main 2022 Physics question

A Carnot engine has efficiency of 50%. If the temperature of sink is reduced by 40°C, its efficiency increases by 30%. The temperature of the source will be:

(A)166.7 K
(B)255.1 K
(C)266.7 KCorrect
(D)367.7 K

Answer: (C)

Solution

Initially 1 − / = 0.5, so = 0.. After the sink temperature is reduced by 40 K, the efficiency becomes

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Question ID VK-034722