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k = mω² ..pers 1
F = k. Δx ..pers 2
P = F / A --> F = P.A ..pers 3
pers 1 dan 3 subtitusi ke pers 2
P.A = mω² . Δx
P.A = m(2πf)² .Δx
P.A = m.4π² f².Δx
sehingga P ~ f² (Dibaca Tegangan sebanding kuadrat frekuensi)
f₁² : f₂² = P₁ : P₂
f₁ : f₂ = √P₁ : √P₂
= √P1 : √4P₁
= 1 : 2
f₂ = 2f₁
= 2 x frek nada dasar C