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A₁ = 9 mm² f₁ = ___ ? mungkin maksudnya f bukan F
A₂ = 25 mm² f₂ = 250 Hz
f = 1/2L √ (F / (ρ A))
frekeunsi berbanding terbalik dengan akar luas penampang
perbandingan
f₂ / f₁ = √A₁ / √A₂
f₂ / f₁ = √(A₁ √A₂)
f₁ = f₂ · √(A₂ / A₁)
f₁ = 250 · √(25 / 9)
f₁ = 250 · ⁵/₃
f₁ = 416²/₃ Hz ← jawaban