A Sphere of Surface Area 1

Multiple Choice

A sphere of surface area 1.25 m² and emissivity 1.0 is at a temperature of 100.0°C.The rate at which it radiates heat into empty space is closest to

A) 7.1 W
B) 0.71 mW
C) 1.4 kW
D) 9.9 mW
E) 3.7 W