A tubular heater with a black inner surface of uniform temperature Ts = 1000 K irradiates a coaxial disk.
(a) Determine the radiant power from the heater that is incident on the disk, qs→1. What is the irradiation on the disk G1?
(b) For disk diameters of D1 = 25, 50, and 100 mm, plot q s→1 and G1 as a function of the separation distance L1 for 0 ≤ L1 ≤ 200 mm.