A sphere a cube and thin circular plate, all made of the same material and having the same mass are initially heated to a temperature of `1000^(@)C`. Which one of these will cool first?

Options

A. plate will cool fastest and cube the slowest
B. Sphere will cool fastest and cube the slowest
C. plate will cool fastest and sphere the slowest
D. Cube will cool fastest and plate the slowest

Answer

C

Explanation

We know that the rate of loss of heat from a body is directly proportional to the surface area of the body. For a given mass of a material, the surface area of a circular plate is maximum and of sphere is least.