Can anybody tell me the difference between these two velocity?

Question

In Waves i earlier studied that

velocity of the wave is given $wa\sqrt{1-y^2}$

w= angular velocity a=amplitude of the wave y=post. of wave at any time

and now when i am studying wave optics velocity is given by

$ƒ*Λ$ f=frequency of the wave ^=wavelength of the wave

are these velocity anyhow related?

Answer 1

$wa\sqrt{1-y^2}$ is the velocity of SHM while $ƒ*Λ$ - velocity of on any wave