[" When two waves with "],[" same frequency and "],[" constant phase difference "],[" interfere,"]

When two waves with same frequency and constant phase differenc interfere,

What happens when a sound wave interfers with another wave of same frequency and constant phase difference?

When two waves of the same amplitude and frequency but having a phase difference of phi , travelling with the same speed in the same direction (positive x), interfere, then

When two waves of the same amplitude and frequency but having a phase difference of phi , travelling with the same speed in the same direction (positive x), interfere, then

Two waves having the same wave length and amplitude but having a constant phase difference but having a constant phase difference with time are known as