First slide

Thermal expansion

Question

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

Easy

A

Both spheres will expand equally
B

Hollow sphere will expand more than solid one
C

Solid sphere will expand more than Hollow one
D

None of the above

Solution

Change in radius of both spheres are same.
Change in radius Δr=r . α Δt
'Δt' and ' α' are same for both spheres.
Hence option - (1) is right.

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