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ChromaDepth
Section V: Physical Objects
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Interfering Sine Waves
Description:This shows the physics of interfering sine waves. This is the type of situation that happens when two rocks are dropped in a pond. Each dropped rock sends out its own rings in the water.
Parts of the rings are high and parts are low. This up-down-up oscillation is known as a sine wave
Things to Notice:
- There are places where a high part of one rock’s rings meets with the high part of the other rock’s rings. Similarly, there are places where low meets low. In these cases, a super-high or super-low spot is produced.
This is known as reinforcement.
- In other places, a high part of one rock’s rings meets with the low part of the other rock’s rings. It results in a spot with zero-height. This is known as cancellation.
- One of acoustic engineers’ strategies for noise abatement is to produce an identical signal to the noise, only inverted, so that everywhere the noise and the second signal cancel to zero-noise.
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