Question

A heat engine uses thermal energy that flows from a heat source with a temperature of 325 K to a cold sink, which has a temperature of 135 K. What is the efficiency of the heat engine? The answer should have three significant figures

Answer 1

The answer is "58.5"

Answer 2

58.5 %

Step-by-step explanation:

temperature of hot source, T1 = 325 K

temperature of cold source, T2 = 135 K

The efficiency of a heat engine is defined as the ratio of work done to the input energy.

the formula to find the efficiency of heat engine is given by

η = 1 - T2 / T1

η = 1 - 135 / 325

η = 0.585

η = 58.5 %