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frequency = wave speed / wavelength

Wave length equals phase speed divided by frequency. So let L be length, S be speed and F be frequency. We usually use letters such as lamda, but L will work.

L=S/F so FL=S and F=S/L. The frequency is the phase speed divided by the wave length.

If it is an electromagnetic wave in a vacuum, then velocity is approximately 3 x 108 meters/second

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Q: What is the formula to find the frequency of a wave?
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