In this post, we will discuss the Wave Equation and derive this equation in easy steps.
Although the speed of a wave can vary, there is a relationship between the speed of a wave and other significant wave characteristics.
Speed is given by:
v =distance traveled/time taken= d/Δt
This can be rewritten in terms of the distance of one wavelength, λ, in one period, T, which will be:
speed v =λ/T………… 
and frequency f = 1 /T …………..
So from equations  and , the relationship becomes:
v = fλ
This is known as the wave equation and applies to both longitudinal and transverse mechanical waves.