Two balls of same material and finish have their diameters in the ratio of 2 : 1 and both are heated to same temperature and allowed to cool by radiation. Rate of cooling by big ball as compared to smaller one will be in the ratio of____________________?
(A) 1 :1
(B) 2: 1
(C) 1 : 2
(D) 4 : 1
(E) 1 : 4
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