2. Radiation is exchanged between surface 1 and surface 2. The surface area of 1 is greater

than that of 2. The fraction of radiation leaving surface 1 that is intercepted by surface 2

is

the fraction if radiation leaving surface 2 that is intercepted by surface 1. (5

pts)

a. greater than

b. less than

c. equal to

surface 1,

T₁ = 1000 K

12

surface 2

T₂ = 300 K