Question: Approximation of a black body by a hole in a sphere, a thin sphere of copper, with its internal surface highly oxidized, has a diameter

Approximation of a black body by a hole in a sphere, a thin sphere of copper, with its internal surface highly oxidized, has a diameter of 6 in. How small a hole must be made in the sphere to make an opening that will have an absorptivity of 0.99?

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