(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A spherical black body having R=0.1m and initial temperature T1=10^3 K is cooled by radiation.The surrounding medium is at a temperature T=0K.What time will it take for the temperature of the sphere to drop to T2=100K?

Given heat capacity is C and density d

The answer is :

(CdR/9σ)(T2^(-3) - T1^(-3))

2. Relevant equations

3. The attempt at a solution

I think just application of Newton's law of cooling will suffice...Isn't it?

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# Homework Help: Heat radiation problem

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