Lecture-24 - Beats Beats,StandingWaves&Instruments...

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eats Standing Waves & Instruments Beats, Standing Waves & Instruments Lecture #24 – Ch. 17.4 & 17.6 Physics 125–Fall 2010 Dr. Mike Melnichuk mmeln@umich.edu Office: 2409 Randall Lab phys125lecture@umich.edu 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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Beats When two waves with DIFFERENT FREQUENCIES mbine we end up with BEATS combine we end up with BEATS. Beat Frequency = difference between the two frequencies. 21 . beat ff f =
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Standing Waves When identical waves traveling in opposite directions overlap nterfere) we end up with STANDING WAVE (interfere) we end up with STANDING WAVES. General Formula for HARMONICS: , 1,2,3,4,. .. 2 n vv fn n L λ ⎛⎞ == = ⎜⎟ n ⎝⎠ 1 1 f 1 2 L = 2 2 2 2 f L v 3 3 3 2 f L = =
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Tube Open at Both Ends Wavelengths and Frequencies: , 1,2,3,4,. .. n vv fn n ⎛⎞ == = ⎜⎟ 2 n L λ ⎝⎠ 1 1 1 2 f L 2 2 2 2 f L
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Tube Open at Only One End Wavelengths and Frequencies: , 1,3,5,. .. no d d vv fn n ⎛⎞ == = ⎜⎟ 4 n L λ ⎝⎠ 1 1 1 4 f L 3 3 3 4 f L
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Standing Waves Quiz One of the strings of a guitar lies along the x-axis when in equilibrium. The end of
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This note was uploaded on 12/08/2011 for the course PHYSICS 125 taught by Professor Unknown during the Fall '08 term at University of Michigan.

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Lecture-24 - Beats Beats,StandingWaves&Instruments...

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