A solid aluminium sphere and a solid copper sphere of twice the radius of aluminium are heated to the same temperature and are allowed to cool under identical surrounding temperatures. Assume that the emissivity of both the sphere is the same. Find the initial ratio of
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CHECK THE SOLUTION.
[ 1 : 4; 2.9 : 1]
e Al = e cu
C – cooling rate
H – heat loss
= 
at t = 0, T A λ = T cu = T.
= 
= 
= 
.
C – cooling rate
= 
= 
= 
= 2.9
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