Question

The hot metal ball is suspended from a string in a metal box as shown in the following figure

(i) What are the ways in which the ball loses heat

(ii) Which side of the box will be the hottest and which the least hot after some time? Explain.

Answer 1

(i) As the ball is suspended in the air there is no material medium present around the ball, it will not lose heat by the process of conduction of convection. The ball will lose heat by the process of Radiation only.

(ii) The speed of heat radiation is equal to the speed of light and intensity of heat radiation does not depend upon direction so all sides of the box would be equally hot as the box is cubical.