Two Identical Solid Spheres Have the Same Temperature

Multiple Choice

Two identical solid spheres have the same temperature. One of the spheres is cut into two identical pieces. These two hemispheres are then separated. The intact sphere radiates an energy Q during a given time interval. During the same interval, the two hemispheres radiate a total energy Q'. What is the ratio Q'/Q?

A) 2.0
B) 0.50
C) 4.0
D) 1.5
E) 0.25