Keywords: Hole in Cavity as Blackbody.png The image depicts the practical implementation of a black body by a small hole entrance to a large cavity with blackened walls Any light ray entering through the hole is almost entirely absorbed hence the hole appears as a true black surface Since the hole is very small the interior of the cavity contains radiation almost in thermal equilibrium with the walls maintained at a fixed temperature Hence the hole emits nearly true blackbody radiation Own 2007-11-04 HighTemplar You can do whatever you want with this image Black body |