Question

Newton's law of cooling holds good only, if the temperature difference between the body and the surroundings is

• A. Less than ${10}^{\circ }C$
• B. More than ${10}^{\circ }C$
• C. Less than ${100}^{\circ }C$
• D. More than ${100}^{\circ }C$

Answer 1

The correct option is A Less than ${10}^{\circ }C$

This is because the rate of loss of heat due to convection is proportional to the temperature difference for small temperature differences only. Hence Newton's law of cooling is derived assuming that the temperature difference is small.Hence , Newton's law of cooling holds good only, if the temperature difference between the body and the surroundings is less than ${10}^{o}C$ .