A sphere a cube and a thin circular plat...

A sphere a cube and a thin circular plate all of same material having same mass are initially heated to `200^(@)C`. Which of these will cool fastest?

Circular plate

Sphere

Cube

All of these

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Verified by Experts

(a) Radiation is direction proportional to the radiating area coooling fast.
For a given mass, area of circular plate is maximum. So, it cools first.

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