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λ = 5cm
v = 50cm/s
v = λ.f
50=5.f
f=10
ω=2πf
=2π.10 =20π
k=2π/λ
=2π/5 =0.4π
pers. gelombang -> y = 2 Sin π (20t - 0.4x) = 2 Sin (20πt - 0.4πx)