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8 October, 05:10

You are told that a wave has a wavelength of 450 x 10^-9 m and a frequency of 6.67 x 1014 Hz. Is it a sound wave?

How do you know?

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  1. 8 October, 05:40
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    The speed of a wave is the frequency times wavelength.

    v = fλ

    v = (6.67*10¹⁴ Hz) (450*10⁻⁹ m)

    v = 3.0*10⁸ m/s

    This wave moves at the speed of light, so it cannot be a sound wave.
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