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Earlier discussion
1 older comment kept for context.
Oluwaseun Adeyemi
Experiment shows that the frequency (f) of the fundamental note from a plucked string is: f = 1/2l √(T/m). Where T is tension and m is mass per unit length. If T and m is constant then √(T/m) = k
:f = 1/2L k :f = k/2L :2fl = k
2f1 L1 = 2f2 L2 :f1 L1 = f2 L2
f1 = 500Hz,L1 = 0.90m
f2 = 150Hz L2 = 500 × 0.9 = 150L
L = (500 × 0.9)/150 = 3m