Q: What is it called when waves combine with each other?

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When two out-of-phase waves combine and cancel each other out.

No. Waves that are out of phase (negative interference) will essentially cancel each other out. Waves that are in phase with each other (positive interference) will combine to create a larger wave.

Normally, two waves do not combine to form a new wave. Two waves approaching from almost the same direction will slowly cross each other. At the point where the waves cross, they will briefly make one wave. Its height can be calculated by a formula which multiplies the height of each wave by a sine function and adds the results.

That is called destructive interference.

When waves act together, you talk about "interference".When they reinforce each other, it is "constructive interference".When they cancel each other, it is "destructive interference".

Related questions

When two out-of-phase waves combine and cancel each other out.

Not necessarily. The two waves could cancel each other out.

No. Waves that are out of phase (negative interference) will essentially cancel each other out. Waves that are in phase with each other (positive interference) will combine to create a larger wave.

the interaction between sound waves is called interference.

Normally, two waves do not combine to form a new wave. Two waves approaching from almost the same direction will slowly cross each other. At the point where the waves cross, they will briefly make one wave. Its height can be calculated by a formula which multiplies the height of each wave by a sine function and adds the results.

its call superposition

That is called destructive interference.

When waves act together, you talk about "interference".When they reinforce each other, it is "constructive interference".When they cancel each other, it is "destructive interference".

Plane waves travel parallel to each other in the same plane hence the name.

only if the waves are IN PHASE. This means if you are looking at a diagram of 2 waves going at each other, both waves have to be the same size, wavelength, AND on the same side of the diagram, whether its on the top or bottom. If one wave is on the bottom and the other on top, but has the same size, it will produce a standing wave.

Waves travel through each other.

The sound levels in the room vary because when its loud the waves combine by constructive interference, the combined wave has a larger amplitude than the original waves did but when its soft the two waves with the same amplitude combine by destructive interference, they cancel each other out.