First slide

Thermal expansion

Question

There are two spheres of same material and radius. One is solid and the other is hollow. If they are heated to the same temperature the expansion of :

Moderate

A

solid sphere is more
B

hollow sphere is more
C

solid and hollow spheres are equal
D

solid is outwards while that of hollow inwards

Solution

The volume of cavity increases radially outward so as to match the volume expansion of solid sphere when increase in temperature is same for both.

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