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HW3_solutions

HW3_solutions - Solutions of Homework#3 Remarks Get...

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1 Solutions of Homework #3 Remarks: Get familiar with these commonly used integrals! a) The power density on a spherical surface with radius r is ( ) 2 2 26 2 4 10 2 4 m W r r W p s π π × = = ( ) ( ) ( ) W d d r p P s 23 60 50 26 27 12 60 50 2 10 95 . 5 cos 180 12 27 4 10 2 sin × = × × × × = = o o o o o o θ π π ϕ θ θ b) The power density is ( ) ( ) 2 2 6 26 2 710.8 1609 10 93 4 10 2 4 m W r W p s = × × × = = π π
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