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Show that the solid angle subtended by a disk shown to the right at the point P which is a distance z from the disk on a line perpendicular to the center of the disk is: ? = 2?(1-cos?) Here is a picture that may help with the question...

A nuclear power plant located on Lake Huron operates an environmental monitoring program which includes annual fish sampling. At the laboratory, the fish are analyzed for the following radionuclides: • Gamma-emitters • Sr-90/Y-90 • Carbon-14 • Tritium One year, some fish samples (lake trout)...