Answer:
81 times the first body
Explanation:
Let the temperature of the first object is T.
The temperature of the second object is 3T.
According to the Stefan's law, the energy radiated per unit area per unit time is given by
So, for the first body
.... (1)
for the second body
..... (2)
By equation (1) and (2),
E2 = 81 times E1
So, the second body gives 81 times more energy per unit area per unit time