Class 11 NEET Physics Thermodynamics and Kinetic Theory

Efficiency (η) of a carnot engine is given by
η=1−

T2

T1

, where T1 is the temperature of the source and T2 is the temperature of the sink.
Here, T2=500K
∴0.5=1−

500

T1

⇒T1=1000K
Now, η=0.6=1−

T′2

1000

(T′2 is the new sink temperature)
⇒T′2=400K