Q 11-11-100JEE MainJEE Main 2022 (24 Jun, Shift 2)Easy
A Carnot engine takes $5000\ \text{kcal}$ of heat from a reservoir at $727^\circ\text{C}$ and gives heat to a sink at $127^\circ\text{C}$. The work done by the engine is
Answer: (D) $12.6\times10^6\ \text{J}$
$\eta = 1 - \dfrac{400}{1000} = 0.6$.
$$W = \eta Q_1 = 0.6\times5000\ \text{kcal} = 3000\ \text{kcal} = 3000\times4200\ \text{J} = 12.6\times10^6\ \text{J}$$
Solution by Sreeraj P, M.Sc Physics