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Raibuookami
The velocity is extraneous information. Frequency is the inverse of the period, thus the frequency of the wave is 1/3 Hz.

Answer:

0.33 Hz.

Explanation:

The frequency of a wave and its period are reciprocal, that is:

[tex]f=\frac{1}{T}[/tex]

But, by hypothesis we know:

[tex]T=3 \ seconds[/tex]

Replacing this on the definition, we have:

[tex]f=\frac{1}{3 \ sec}=0.33 \ Hertz[/tex]

Therefore, the frequency of the wave is 0.33 Hz.

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