PHYS 105 1nd Edition Lecture 14Outline of Last Lecture I. Decibels Outline of Current Lecture II. Sound Pressure LevelIII. Multiple SourcesCurrent LectureSound Pressure Level- Average intensity of a sound is related to the sound pressure -I=p2ρv-ρ =1.293kgm3-v =331ms-sound impedance= pv=400kgm2s-I0=10−12Wm2-p0=2 x 10−5Nm2-Sound Pressure Level : Lp= 20 logpp0-p0=2 x 10−5Nm2Multiple Sources- When several sources play together, the final intensity is the sum of individual intensities - EXAMPLE: 2 un-correlated sound sources with 80 dB each are played together, the combined sound is 83 dB. The intensity of the combined sound increases by a factor of2, which is 3 dB above the SPL of a single sourceThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a
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