Question

Two copper spheres A and B of the same surface finish are taken. Sphere B weight half as A. Both are heated to the same temperature and let in a room to cool by radiation only. What is the ratio of initial rate of loss of heat of A and B.

(1) 1.59 

(2) 15.9

(3) .159 

(4) 159

Answer 1

Correct Answer is: (1) 1.59 

It is given that m_B = 1/2 m_A.

so the ratio of initial rate of loss of heat is given by