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You are given a disc, a cube and a spher...

You are given a disc, a cube and a sphere, All of them have the same material, volume and nature of the surface. They are heated to `400^(@)C` and are left in air. Which one of these will have the lowest rate of cooling?

A

Cube

B

Disc

C

Sphere

D

All will have the same rate of cooling

Text Solution

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The correct Answer is:
C
All of them have the same e, T, `T_(0)`, volume and specific heat.
Hence rate of loss of heat is proportional to area. For a given volume, the sphere has the minimum area. Hence it has the lowest rate of cooling.
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