PHYS 105 1nd Edition Lecture 13Outline of Last Lecture I. Hearing SystemOutline of Current Lecture II. Fechner’s Law and Logarithms in Sound and MusicIII. Decibels IV. Sound Intensity LevelCurrent LectureI. Fechner’s Law and Logarithms in Sound and Music- Frequency response of ear, music scale and loudness of sound intensity level are all logarithmic - Logarithm of a “number” is the power to which 10 (base) must be raised to give the “number”o Log AB = Log A + Log Bo Log An = n Log Ao Log A/B = Log A – Log Bo Log 1 = 0- Psychoacousticso The relationship between the stimuli and the perceived sensation o “Depending on the individual person”II. Decibels - Sound power leveloLw=10 logWW0W0=10−12 wat- Decibel of two power levelso∆ L=L2−L1 10 logW2W1These notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.III. Sound Intensity Level-LI=10
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