# 1. Show that F 12 for two black parallel planes of equal areas connected by reradiating walls at a..

1. Show that F_{12} for two black

parallel planes of equal areas connected by reradiating walls at a constant

temperature is

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1. Show that F 12 for two black parallel planes of equal areas connected by reradiating walls at a..

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where F_{12} is the shape factor of

the black bodies.

2. Calculate the rate at which radiant

energy streams out from a conical cavity having a semi-vertex angle of 45° and

height 300 mm, if the surface temperature of the cavity is 600 K and the

emissivity is 0.8.