Persamaan gelombang y = 4 sin phi (40t - x/30) y,x, dalam cm. Tentukan v = ....

Y= 4 sin π (40t - x/30)
Y= 4 sin (40πt - πx/30)

Y= A sin (wt - kx)
A= 4
W= 40π
K= π/30

Dit= V...?
Penyelesaian=
V= W/K
= (40π)/(π/30)
= 1200π/π
= 1200 m/s

Bedakan π (pi) dengan φ (phi)!
y = A sin (ωt - kx)
y = 4 sin (40πt - πx / 30)
v = ω / k
  = (40π rad/s) / (1/30 π cm⁻¹) = 1200 cm/s