Our hearing picks up a limited range of sounds, limits that were used successfully to keep teenagers from congregating outside British grocery stores by a device called the “teenage sound repeller." ...
They don't hear anything. Nothing, nothing. I don't hear anything. And I'm supposed to have very good hearing. Today we field tested the new ringtone, downloaded the sound onto the cell phone, and hit ...
Why does feedback between a microphone and speaker generate a high-pitched noise, and not a low one? • Sounds can be viewed as combinations of sine waves of different frequencies. The Barkhausen ...
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