A Carnot engine whose sink is at 300K has an efficiency of 40%. By how much should the temperature of the source be increased to as to increase its efficiency by 50% of original efficiency?

A) 150 K

B) 250 K

C) 300 K

D) 450 K

Given,

Initially

The temperature of the sink =

Let, the temperature of the source=

The efficiency of a Carnot engine

Now efficiency is increased by 50%

So, new efficiency =

Let, the new temperature of source =

So the increase in temperature of source need to increase efficiency of Carnot engine by 50% =