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Question

A hot metallic sphere of radius r radiates heat. It's rate of cooling is
  1. proportional to r2
  2. proportional to 1/r
  3. independent of r
  4. proportional to r


Solution

The correct option is B proportional to 1/r
Rate of cooling, RC=dθdt=σAe(T4T40)mc
dθdtAVr2r3dθdt1r

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