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λ = v / f
λ = v t / n
λ = 75 3 / 15
λ = 15 cm
Semoga membantu :)
v : cepat rambat
T : periode = t/n 3/15 = 0.2s
lambda = v.T
lambda = 75.0,2
lambda = 75x1/5
lambda = 15 cm
Jadi Panjang Gelombang = 15cm