Jawabanmu

2014-08-14T12:55:31+07:00
A = 2cm
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)