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v = 15 m/s
L = 50 cm
n = 2
ditanya =
f = ...
dijawab =
λ = L / n
= 50 cm / 2
= 25 cm
= 0,25 m
v = λ . f
f = v / λ
= 15 m/s / 0,25 m
= 60 Hz