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

A sphere a cube and thin circular plate, all made of the same material and having the same mass are initially heated to a temperature of `1000^(@)C`. Which one of these will cool first?

A

Plate

B

Sphere

C

Cube

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
A
Rate of cooling ­-
`(DeltaQ)/(t)=(A epsilon sigma (T^4-T_0^4))/(mc)` , as `(DeltaQ)/(t) prop A`
Area of plate is largest, it will cool fastest.
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