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- sumber bunyi
F → f₀
F' = 4F → f₀' = ___ ?
f₀ = 1/2L √(F/μ)
frekuensi nada dasar berbanding lurus dengan akar gaya tegangan dawai
f₀' : f₀ = √F' / √F
f₀' = √(F'/F) · f₀
f₀' = √(4F/F) · f₀
f₀' = √4 · f₀
f₀' = 2 f₀ ← jwb
nada dasar menjadi 2 kali semula.