The rate of a cooling of a heated solid sphere is R cal/min. If it is divided into two hemispheres the rate of cooling at the same temperature will become-
Text Solution
Verified by ExpertsThe correct answer is:
B
When a sphere is split into two hemispheres:
Original surface area of sphere: 
Each hemisphere: curved surface 
, flat base 
So, two hemispheres total surface area: 
Thus, increase in surface area:
Hence, new rate of cooling 
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