It depends. if the waves are in sync with each other, they will amplify. If they are out of sync, they will be negated.
The amplitudes add.
diffraction
The principle is superposition. This means that when two waves overlap, their displacements add up to create a new wave that is the sum of the two individual waves.
The resultant wave has double the amplification
The correct answer is ''Interference"
interference
Constructive interference occurs when the crests of two waves overlap. This results in an increase in the amplitude of the combined wave.
When two or more waves overlap, they can interfere constructively, resulting in a wave with greater amplitude, or destructively, resulting in a wave with lesser amplitude or cancellation. The resulting wave's amplitude is determined by the superposition of the individual waves.
When two or more waves overlap, it is called interference. Interference can result in amplification (constructive interference) or cancelation (destructive interference) of the waves depending on their phase relationship.
interference
Resonance.
Wave amplification