Physics

Problem

Two Carnot engines

A

and

B

are operated in series. The first one,

A

receives heat at

T_1 (= 600 \text{ K})

and rejects to a reservoir at temperature

T_2

. The second engine

B

receives heat rejected by the first engine and in turn rejects to a heat reservoir at

T_3 (= 400 \text{ K})

. Calculate the temperature

T_2

if the work outputs of the two engines are equal. (2019 Main, 9 Jan II) (a) 600 K (b) 500 K (c) 400 K (d) 300 K