| 1 | This wave of excess density is sound. | |
| 2 | Sound waves are measured by their amplitude. | |
| 3 | That' s the interference of sound waves from the forks. | |
| 4 | This wave pattern occurs often in nature, including ocean waves, sound waves, and light waves. | |
| 5 | It produces an inverted sound wave to cancel out unwanted noise in the headphone signal. |
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