Lecture 11 - March 8, 2008 Physics 40B Lecture 11 1 Physics...

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Unformatted text preview: March 8, 2008 Physics 40B Lecture 11 1 Physics 040B/001-S08 Chap. 16:4-8 Standing Sound Waves, Beats and Doppler Effect Review " = (10 dB )log 10 I I o # $ % & ( where I o = 10 ) 12 W / m 2 (Ratio of intensities equal to difference in db) Intensity ( I ( W / m 2 )) from point source I = P 4 " r 2 and I 1 I 2 = r 2 2 r 1 2 For plane wave in one direction I = 1 2 B # kA 2 = p max 2 2 $ B Pressure Wave: p = p max sin( kx "# t ) where p max = BAk = $ v # A Pressure wave is 90 o out of phase with displacement wave Propagation Velocity: v = B " v = # RT M for Ideal Gas March 8, 2008 Physics 40B Lecture 11 2 Standing sound waves and normal modes Experiments often done in a first physics course laboratory will use common materials to reveal standing sound waves in resonance. March 8, 2008 Physics 40B Lecture 11 3 Air Columns as Organ Pipes End of Organ Pipe where air enters is considered a pressure node (at atmospheric pressure) and a displacement antinode....
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Lecture 11 - March 8, 2008 Physics 40B Lecture 11 1 Physics...

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