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19 July, 07:26

The ultraviolet light that causes suntans (and sunburns!) has a typical wavelength of 300 nm. what is the frequency of these rays?

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  1. 19 July, 07:30
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    Using the formula:

    v = fλ, where v is the speed of the wave, f is its frequency and λ is its wavelength.

    The speed of ultraviolet light is equal to that of light. Therefore:

    f = v/λ

    f = 3 x 10⁸ / 300 x 10⁻⁹

    f = 1 x 10¹⁵ Herz
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