Can we apply this equation `c = upsilon lambda` , to a sound wave '?

Whether can we apply c = va to sound waves ?

A sound wave consists of

A wave is given by the equation y=A sin 2pi ("f"t-x//lambda) Its maximum particle velocity is four times the wave velocity, when lambda is

The cartesian equation of the plane whose vector equation is r = (1 + lambda - mu) i + (2 - lambda) j + (3- 2 lambda + 2mu)k , where lambda, mu are scalars, is

Write a relation between wavelength (lambda) , frequency (upsilon) and speed of wave (c).