Question

Which law states that the rate of heat radiated by a body is directly proportional to the excess of temperature, provided that the excess temperature is less as compared to the surrounding temperature?

(a) Pascal’s law

(b) Newton’s law of cooling

(c) Einstein’s equation

(d) Henry’s law

This question was addressed to me during an internship interview.

My doubt stems from Cooling System in division Fuel Supply and Cooling System of Farm Machinery

Answer 1

The correct option is (b) Newton’s law of cooling

The best I can explain: Newton’s law of cooling states that the rate of heat radiated by a body is directly proportional to the excess of temperature, provided that the excess temperature is less as compared to the surrounding temperature. It is expressed as

\(\frac{∂θ}{∂t}\) = KA(θ-θ0)