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= 1 : 1/3 = 3 Hz
V = panjang 1 gelombang x f
= 0,4 x 3 = 1,2 m/s (B)
= 0,4 x 3 = 1,2 m/s (B)
f = n/t
= 1 : 1per 3
= 3 Hz