Q11.7Multiple choice
The radius of a metal sphere at room temperature T is R, and the coefficient of linear expansion of the metal is α . The sphere is heated a little by a temperature ∆T so that its new temperature is T + ∆T . The increase in the volume of the sphere is approximately
- (a)2 π R α ∆ T
- (b)π R 2 α ∆ T
- (c)4π R 3α ∆T /3
- (d)4π R 3α ∆T