**Stationary waves occur when two waves that meet are:**

- of the same type
- of the same frequency
- of the same amplitude
- travelling in opposite directions

**If two waves with amplitude A meets,**

**Properties of stationary waves:**

- Every point bounded within two consecutive nodes is in phase with one another. (reach amplitude/equilibrium positions at the same time)
- Points bounded within a pair of nodes are $\pi$ $(180^{o})$ out of phase with points bounded within the next neighbouring pairs.
- There is no net energy transfer from one end of the wave to the other.
*The two waves interfering are identical and hence transfer equal amount of energy from one side to the other.* - No observable propagation of wave.