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Earlier discussion
1 older comment kept for context.
Oluwaseun Adeyemi
For a string fixed at both ends and plucked at the middle, the fundamental frequency is given<br>by f<sub>0</sub> = v/λ, where v = velocity of sound, λ = wave length.<br>At its fundamental, note, the the length of the string is given l = λ/2, => λ<sub>0</sub> = 2l, where λ<sub>0</sub> = wave length fundamental note. for the first over tone, λ<sub>1</sub> = l. <br>For the second over tone, λ<sub>2</sub> = 21/3 = (2 x 24)/3 = 16cm.<br>i.e. λ<sub>2</sub> = 16cm.