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2,5 lamda = 7,5 m
lamda = 3 m
v = 30 m/s
dit : f
v = lamda . f
f = v/lamda = 30/3 = 10 Hz
lamda = panjang gelombang/ banyak gelombang
= 7,5 / 2,5
= 3
frekuensi = 30/3 = 10Hz