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." ...

"Wondering About Sound" is an educational film that explores the nature of sound and how it is created through vibrations. It explains that sounds can be high or low, loud or soft, and are caused by ...

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 ...