تسجيل الدخول

تسجيل

Limit of Audibility

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-235

2025-11-20

542

Every one knows that the range of voice differs for different people, one person singing tenor, another alto, and so on. There is a somewhat similar range in hearing, some ears being more sensitive to the high pitches, and some to the low.

small brass whistle with a rubber bulb at one end and a screw for adjusting the pitch at the other. Press the bulb when the screw is nearly out, and a rather low whistle will be  heard. Turn in the screw a little, and sound again. The pitch is higher. In this way make the pitch steadily higher and higher, and it will be found that first one member of the class and then another will be unable to hear the whistle.