p34_025 - 25. (a) Since c = f , where is the wavelength and...

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25. (a) Since c = λf ,where λ is the wavelength and f is the frequency of the wave, f = c λ = 2 . 998 × 10 8 m / s 3 . 0m =1 . 0 × 10 8 Hz . (b) The magnetic Feld amplitude is B m = E m c = 300 V / m 2 . 998 × 10 8 m / s =1 . 00 × 10 6 T . ~ B must be in the positive z direction when ~ E is in the positive y direction in order for ~ E × ~ B to be in the positive x direction (the direction of propagation). (c) The angular wave number is k = 2 π λ = 2 π 3 . 0m =2 . 1rad / m . The angular frequency is ω =2 πf =2 π (1 . 0 × 10 8 Hz) = 6 . 3 × 10 8 rad / s . (d) The intensity of the wave is I = E 2 m 2 µ 0 c = (300 V /
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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.

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