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lamda itu panjang 1 gelombang ya
diketahui
n= 2,5
s= 400 cm= 4 m
v= 32 m/s
ditanya
f=...?
jawab
λ= s/n
λ= 4/2,5
λ= 1,6 m
v= λ × f
f= v ÷ λ
f= 32/1,6
f= 20 Hz