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Waves and Wave Motion
All wave motion, then, is this process. And you don't notice the off pulse, except in a slow light like an arc lamp. It's exactly the same thing with sound. You hear a high note that goes, it seems much more continuous. That's because the vibrations are faster than a low note,. As when i go. Now in that you can hear a kind of graininess. The graininess is because you are hearing the rapid alternations of on and off on a lower note.