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You are given two spheres of same material and radii 10 cm and 20 cm. They are heated to the same temperature. They are placed in the same environment. The ratio of their rates of cooling will be: |
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Answer» `1 : 2` `(dT)/(dt) = (e A SIGMA)/(mc) (T^(4) -T_(0)^(4))` `rArr (dT)/(dt) prop (A/(m) ` `prop (R^(3))/(r^(3))` `prop (1)/( r )` `rArr (((dT)/(dt))_(1))/((dT)/(dt))_(2) =(20)/(10) =(2)/(1)` |
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