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6 November, 10:33

Select the correct answer. A light wave travels at a speed of 3.0 * 108 meters/second. If the wavelength is 7.0 * 10-7 meters, what is the frequency of the wave? A. 2.5 * 10-14 hertz B. 4.3 * 1014 hertz C. 1.7 * 10-14 hertz D. 5.1 * 10-14 hertz

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  1. 6 November, 12:18
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    Given that speed of light is

    c=3*10^8m/s

    Wavelength λ is give as

    λ=7*10^-7

    Wavelength formula is given as

    c=fλ

    Then,

    f=c/λ

    f=3*10^8/7*10^-7

    f=4.29*10^14Hz

    Which is approximately

    f=4.3 * 10^14Hz

    The correct option is B.
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