A solid cube and a solid sphere of the same material have equal surface area. Both are at the same temperature 1200C, then

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Both the cube and the sphere cool down at the same rate

The cube cools down faster than the cube

The sphere coolds down faster than the cube

Whichever is having more mass will cool down faster

answer is B.

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Detailed Solution

Rate of cooling of a body R = ∆θt = Aεσ(T4-T04)mc⇒ R directly proportional to Am directly proportional to AreaVolumeVolume of cube < Volume of sphere⇒ Rcube > Rsphere i.e., cube, cools down with faster rate

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