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f = 400 Hz
λ = 50 cm = 0,5 m
Ditanyakan : v ?
Dijawab :
v = f x λ
= 400 x 0,5
= 200 m/s
v = panjang gelombang x frekuensi
v = 0,5 x 400
v= 200 m/s
maaf kalau salah :)