As water wave approaches a beach  their wavelngth decreases. If the frequency of of the wave does not change what must be happening to their speed?

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For any wave the velocity of the wave is equal to the product of the frequency and the wavelength.

As a water wave approaches a beach its wavelength decreases. But there is no change in the frequency of the wave. For this to happen the velocity of the wave has to decrease.

When water waves approach the beach their speed slows down. There are several reasons for this, the first is the obstruction that is presented by the shore line, another is the slowing down of wind as it moves over land. The speed of water waves is to a large extent due to the wind that moves over it.

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