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A circular plate, a cube and a sphere, a...

A circular plate, a cube and a sphere, all made up of same material and having the same mass, are heated to `300^@C` and left in a room. Which of them will have the slowest rate of cooling?

A

Circular plate

B

Cube

C

Sphere

D

All will cool at the same rate

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The correct Answer is:
C

Sphere
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