The speed of a wave is equal to the product of its frequency and wavelength.
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The speed or velocity of a wave is equal to the wavelength times the frequency. The period (amount of time for one wavelength to occur) is equal to 1 over the frequency (the inverse of its frequency).
Divide the speed by the wavelength. (For any wave, the wavelength times the frequency is equal to the speed of the wave.)
The product of both is equal to the speed of the wave.
It is a constant which is equal to the speed.
The product of its wavelength multiplied by its frequency is always equal to its speed. I think that's true even if the speed is not constant.