question_answer

According to Newton's law of cooling, the rate of cooling of a body is proportional to \[{{(\Delta \theta )}^{n}}\], where \[\Delta \theta \] is the difference of the temperature of the body and the surroundings and n is equal to [AIEEE 2003]

A)  2                    

B)       3

C)  4                    

D)       1

Correct Answer: D

Solution :

[d] According to Newton's law of cooling,

But                         (given)

n = 1