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

1. Show that F12 for two black
parallel planes of equal areas connected by reradiating walls at a constant
temperature is

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where F12 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.

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