A body with an initial temperature theta , is allowed to cool in a surrounding which is at a constant temperature of theta_(0)(theta_(0)lt theta_(i)) . Assume that Newton.s law of cooling is obeyed. Let k = constant. The temperature of the body after time t is best expressed by
According to Newton's law of cooling, the rate of cooling of a body is proportional to (Deltatheta)^(n),"where "Deltatheta is difference of temperature of body and surroundings, and n is equal to
Two solid spheres A and B made of the same material have radii r_(A) and r_(B) respectively . Both the spheres are cooled from the same temperature under the conditions valid for Newton's law of cooling . The ratio of the rate of change of temperature of A and B is
State the conditions under which Newton s law of cooling is applicable.
VGS PUBLICATION-BRILLIANT-TS MARCH- 2018-SECTION C
