A plane electromagnetic wave, with wavelength 5 m, travels in vacuum in the positive x direction with its electric vector E, of amplitude 22

Question

A plane electromagnetic wave, with wavelength 5 m, travels in vacuum in the positive x direction with its electric vector E, of amplitude 229.1 V/M, directed along y axis. What is the time-averaged rate of energy flow in watts per square meter associated with the wave

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Hưng Khoa 3 years 2021-08-16T00:48:10+00:00 1 Answers 18 views 0

Answers ( )

  1. thuhuong
    0
    2021-08-16T00:49:44+00:00
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    Answer:

    Explanation:

    E₀ = 229.1 V/m

    E = E₀ / √2 = 229.1 / 1.414 = 162 V/m

    B =  E / c  ( c is velocity of em waves )

    =   162 / (3 x 10⁸)  = 54 x 10⁻⁸ T

    rate of energy flow =  ( E x B )  / μ₀

    = 162 x 54 x 10⁻⁸ / 4π x 10⁻⁷

    = 69.65 W per m².

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