Further phenomena can be observed when several waves are superimposed.
Example: If you throw two stones into the water at the same time, you can see that the resulting circular waves penetrate each other without disturbing each other. This applies to all types of waves.
Waves permeate each other without disturbing each other' s propagation.
There is a technical term for the case of a superposition of waves of the same frequency: interference.
In such an overlay, areas of amplification and absorption/elimination are formed.
This is the result of adding the amplitudes of the individual waves:
Amplification
When two crests or two troughs meet (two identical or similar phases), an even higher crest or an even deeper trough is formed - the amplitude of the deflection is thus increased.
Absorption or elimination
If the crest of one wave meets the trough of the other wave (the phase shift between the waves is then an odd multiple of half the wavelength), the wave is reduced - the positive and negative amplitudes add up. If the amplitudes are equal, complete elimination occurs.