Question

A heat engine operates with the cold reservoir at temperature 324 K. The minimum temperature of the hot reservoir, if the heat engine takes 300 J heat from the hot reservoir and delivers 180 J heat to the cold reservoir per cycle, is _____ K.

Answer 1

The correct answer is 540
$( 1 - \frac{324}{T_H}) = \frac{300 - 180}{300}$
$⇒ 1 - \frac{2}{5} = \frac{324}{T_H}$
$T_H = 324 × \frac{5}{3}$
$T_H$ = 540 K