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Finding the Fundamental Frequency of a Standing Wave

APPH12-MEYIQ3

Consider the standing wave vibrating at the fourth harmonic graphed below. The string is attached at both ends.

If this wave travels down the string at a velocity of $10\text{ m/s}$, what is the fundamental frequency at which the rope vibrates?

A

$3.21\text{ Hz}$

B

$2\text{ Hz}$

C

$8\text{ Hz}$

D

$0.80\text{ Hz}$