Question

Two spheres of the same size are made of the same metal, but one is hollow but the other is solid.When , they are heated to the same temperature then

• A. the hollow sphere will expand more
• B. the solid sphere will expand more
• C. both spheres will expands almost equally
• D. only the solid sphere will expand

Answer 1

The correct option is C both spheres will expands almost equally

As thermal expansion of isotropic solids is similar to true photographic enlargement, the expansion of a cavity is same as if it were a solid body of the same material.

i.e. $△V=\gamma \alpha △T$

$\gamma ,\alpha ,△T$ are the same for both solid and hollow spheres, so the expansions of both will be equal.