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λ = 0,6 m
v = f x λ
= 40 x 0,6 = 24 m/s
t= 5 menit = 5 x 60 = 300 s
lambda = 0,6 m
dit ; v..?
jwb ;
f= n/t
= 12.000/300
= 40 Hz
v= lambda x f
= 0,6 x 40
= 24 m/s
semoga membantu ^_^