Although the speed of a wave is found by multiplying the frequency by the wavelength, it’s important to note that the wave speed doesn’t change if you change the wavelength or frequency. What actually happens is that if you change the frequency, you also change the wavelength so the wave speed will remain constant. The speed of the wave depends only on the properties of the medium it’s traveling through, so the only way to change the wave speed is to change the properties of the medium itself.
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