First slide

Radiation

Question

A sphere, a cube and a thin circular plate all made of the same mass and finish are heated to a temperature of 200^oC; which of these objects will cool slowest when left in air at
room temperature ?

Moderate

A

The sphere
B

The cube
C

The circular Plate
D

All will cool at the same rate

Solution

Sphere has minimum surface area hence it takes more time to cool at same rate.

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