Question: ( 2 5 p t ) Consider coaxial, parallel, black disks separated by a distance of 0 . 2 0 m . The upper disk

(25pt) Consider coaxial, parallel, black disks separated
by a distance of 0.20m. The upper disk of diameter 0.20
m is maintained at 456K and the surroundings are at 300
K. The diameter of the lower disk is 0.4m. What is the net
heat transfer by radiation from the lower disk? (Emissivity
of surroundings is =1)
(25pt) Consider coaxial, parallel, black disks separated by a distance of

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