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= 2,5/0,5
= 5 Hz
v = panjang gelombang x frekuensi
= 20 cm x 5 Hz( karena ada 4 gelombang yan dicari hanya 1 gelombang saja panjang nya jadi rumus nya = panjang gelombang/banyak gelombang = 80/4 = 20 cm )
= 100 cm/s