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f = 15 KHz = 15000 Hz
v = 140 m/s
Dit :
λ = ..............?
Penyelesaian :
λ = v/f
λ = 140/15000
λ = 0,00933 m
λ = 0,93 cm
Jadi, panjang gelombang itu adalah 0,93 cm
Ok?