The emissivity of non-polished gold is about 0.47. Suppose a non-polished solid golden sphere has a radius of 0.2 m and is at a temperature of 158oF. If this sphere is placed in a room in which the temperature is 68oF, determine the rate in which heat is leaving the sphere (due to radiation) into the room.
(a) 56.8 W
(b) 66.8 W
(c) 76.8 W
(d) 86.8 W
(e) 96.8 W
(f) None of the above.