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More waves.

1. Homework Statement

A periodic transverse wave is established on a string such that there are exactly two cycles traveling along a 3.0m section of the string. The crests move at 20 m/s. What is the frequency of the wave?

2. Homework Equations

?

3. The Attempt at a Solution

Dont know how to do it.
 
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Let's take the problem apart a bit. for starters if there are two cycles in a 3.0m section that's essentially saying that 2*wavelength = 3.0m, right?

Now, how do we find frequency from wavelength?
 

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