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≡ Diketahui:
⇔ v = 30.000 m/s
⇔ λ = 7,5 m
≡ Ditanya: Frekuensi [f]?
≡ Dijawab:
⇒ v = λ × f
⇒ 30.000 m/s = 7,5 m × f
⇒ f = 30.000 / 7,5 m
∴ f = 4.000 Hz