When two identical progressive waves with sane amplitude and frequency travel through a medium with equal velocity in opposite direction, they super impose over each other and produce a new type of wave which is known as Stationary Wave or Standing Wave.
- In stationary waves there is no flow of energy along the waves.
- When stationary waves are set up in a medium, the medium vibrates in several segments called Loops.
- The point of destructive interference is called NODE, at nodes displacement is zero.
- The point of constructive interference is called ANTINODES, at Antinodes displacement is maximum.