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# Lecture-22 - Sound Sound Lecture#22 Ch.16.5&16.11...

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und Sound Lecture #22 – Ch. 16.5 & 16.11 Physics 125–Fall 2010 Dr. Mike Melnichuk [email protected] Office: 2409 Randall Lab [email protected] ffice Hours: 2:00 :00 / Mon & Tue Rm 1416 Randall Lab Office Hours: 2:00 – 4:00 / Mon. & Tue. in Rm. 1416 Randall Lab.

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Sound Intensity The Sound INTENSITY is the Power (P) of that sound that passes perpendicularly through a surface dividedby the Area (A) of that surface. P I = A The Intensity of a Point Source emitting 2 spherically uniform is: ; the is 4 the distance from the source where the P Ir r π = intensity of sound is measured.
Decibels The DECIBEL (dB) is a unit used when COMPARING two sound Intensities. The INTENSITY LEVEL (in decibels) is defined by: β 10 0 (10 )log I dB I ⎛⎞ = ⎜⎟ ⎝⎠ 0 where is the Inte I -12 2 nsity of the Reference Level having the value =10 W/m for the human ear. I 21 0 10 22 1 0 I , or 10 for two dB I dB ββ −= = 11 I arbitrary intensities I and I . I

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Quiz #1 If the intensity level is zero decibels, what does it mean garding either one of the two intensit

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Lecture-22 - Sound Sound Lecture#22 Ch.16.5&16.11...

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