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Waves and Sound: Frequency of harmonic waves with crests that are 2.5 m apart

Harmonic waves are sent along a rope at a speed of 20m/s. What is the frequency of the wave if successive wave crests are 2.5 m apart?

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Note:
I assumed that crests mean "positive maximum amplitude" of the wave.

Let d be the wave-length and u is the speed of the wave.

Think abou this this way.
If you look at the ...

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