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L = Panjang dawai
fo, L = 1/2 L'
f1, L = L'
f2, L = 3/2 L'
f3, L = 2 L'
f4, L = 5/2 L'
fo = 10 Hz
v = L' f
v/L' = f
v/(2L) = 10
u/ f4
v/(2/5 L) = 5 × (v/2L) = 5 × 10 = 50 Hz