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λ = 0,75 m = 3/4 m
perode = T, dan frekuensi = f
f = v/λ = 300 / 3/4 = 4.300 / 3 = 400 Hz
T = T = λ/v = 3/4 / 300 = 1/100 sekon
periode: satu gelombng 15