Question

According to Newton's law of cooling, the rate of cooling of a body is proportional to (Δθ)ⁿ , where Δθ is the difference of the temperature of the body and the surroundings, and n is equal to
(a) two 

(b) three 

(c) four 

(d) one.

Answer 1

(d)  According to Newton's law of cooling, rate of cooling is proportional to Δθ
Therefore,  (Δθ)ⁿ = (Δθ) or n = 1.