BIOL 4030 Lecture Notes - Lecture 52: Sound, Hospital-Acquired Infection, Otoscope
23 Aug 2020
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Document Summary
Percussing over body structure produce vibrations producing characteristic waves and are heard as notes . Each of the five percussion notes is differentiated by the following components: amplitude (intensity) loud or soft sound. The louder the sound the greater the amplitude. Loudness depends on the force of the blow and the structure"s ability to vibrate: pitch (frequency) number of vibrations per second (cps) or cycles per second. More rapid vibrations produce a high pitched tone, slower vibrations yield a low pitched tone: quality (timbre) subjective difference due to sound"s distinctive overtones. Pure tone is a sound of one frequency. Variations within a sound wave produce over-tones: duration length of time the note lingers. Lung) produces louder, deeper and longer sounds because it vibrates freely: denser, more solid structures (ex. Liver) give softer, higher, shorter sounds because it doesn"t vibrate as easily. The note you hear depends on underlying structure, and the body wall and correct technique.
