17. The intensity is the rate of energy ﬂow per unit area perpendicular to the ﬂow. The rate at which energy ﬂows across every sphere centered at the source is the same, regardless of the sphere radius, and is the same as the power output of the source. If
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This note was uploaded on 11/12/2011 for the course PHYS 2001 taught by Professor Sprunger during the Fall '08 term at LSU.