ch33-p016 - 16. (a) The expression Ey = Em sin(kx t) it...

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16. (a) The expression E y = E m sin( kx ω t ) it fits the requirement “at point P … [it] is decreasing with time” if we imagine P is just to the right ( x > 0) of the coordinate origin (but at a value of x less than π /2 k = λ /4 which is where there would be a maximum, at t = 0). It is important to bear in mind, in this description, that the wave is moving to the right. Specifically, 1 (1/ ) sin (1/ 4) P xk = so that E y = (1/4) E m at t = 0, there. Also, E y = 0 with our choice of expression for E y . Therefore, part (a) is answered simply by solving
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This note was uploaded on 06/03/2011 for the course PHY 2049 taught by Professor Any during the Spring '08 term at University of Florida.

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