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n = 30 gelombang
t = 3 s
λ = 20 cm = 0,2 m
dit : v ?
dijwab :
f = n/t
= 30/3
= 10 Hz
v = f x λ
= 10 x 0,2
= 2 m/s
v = lamda x f
= 0,2m x 10
=2m/s