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T = 2,5 s
x = 25 cm
v = __?
Jarak 2 perut terdekat merupakan setengah panjang gelombang.
Jadi panjang gelombang
½ λ = x = 25 cm
λ = 50 cm
Kecepatan rambat
v = λ / T
v = (50 cm) / (2,5 s)
v = 20 cm/s ← jwb