967_Physics ProblemsTechnical Physics

967_Physics ProblemsTechnical Physics - 308 P34.55...

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308 Electromagnetic Waves P34.55 (a) B E c max max . . == × 175 300 10 583 10 8 7 ±Vm ms T k = 22 00150 419 π λ . m rad m ω × kc 126 10 11 r a d s Since S is along x , and E is along y , B must be in the direction z . (That is SEB ∝× .) (b) S EB av max max . 2 40 6 0 µ Wm 2 Si av = 40 6 . ± 2 ej (c) P S c r × 2 271 10 7 N m 2 (d) a F m PA m = × 0750 0500 406 10 7 7 .. . . Nm m kg ±ms 2 e j ai = 406 nm s 2 ± P34.56 Of the intensity S = 1340 W m 2 the 38.0% that is reflected exerts a pressure P S c S c r 1 2 20380 . af . The absorbed light exerts pressure P S c S c a 2 0620 . . Altogether the pressure at the subsolar point on Earth is (a) PP P S c total 2 Pa =+= = × 12 8 6 138 1381340 616 10 . . . . (b) P P a total 2 2 times smaller than atmospheric pressure
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This note was uploaded on 12/14/2011 for the course PHY 203 taught by Professor Staff during the Fall '11 term at Indiana State University .

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