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Vibrations and Wave Motion

المؤلف:  GEORGE A. HOADLEY

المصدر:  ESSENTIALS OF PHYSICS

الجزء والصفحة:  p-192

2025-11-12

591

 A body or a particle that has simple harmonic motion is vibrating. The greatest distance reached from the position of rest is the amplitude of the vibration. The vibration is longitudinal when this motion has the same direction as the length of the vibrating body; it is transverse when the motion is perpendicular to the length.

When rapid vibrations are set up in one part of an elastic body, they are transmitted to the other parts in the form of waves.ESSENTIALS OF PHYSICS

Demonstration. - Procure a half-inch spiral coil of spring brass wire 10 or 12 ft. long, or make one by winding the wire on a piece of gas pipe fixed to turn in a lathe. Hook one end of the coil to а screw hook in a post, and taking the other end in the hand, stretch it somewhat. Strike the coil a light, vertical blow near the hand, and a wave will run to the fixed end and return (Fig. 1). The sudden jerk felt by the hand as the reflected wave strikes it shows that the wave transmits the energy of the blow.