Heat Transfer Questions

Q.  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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