lecture24_th4_15

lecture24_th4_15 - Clicker question What is v in the...

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What is “v” in the formula v=f for an open pipe? A) The speed of sound in air, 344 m/s. B) Some other speed. Clicker question
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Phys 1240: Sound and Music Help reduce distractions during lecture Stop side conversations Turn off cell phones Put away laptops Put away newspapers or other reading Don’t leave in last 5 minutes of class
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www.colorado.edu/physics/phys1240 LAST TIME: Music, harmonics of string and wind instruments. TODAY: Wind instrument harmonics. NEXT TIME: Spectra. READ : 8.1, 8.2 • Homework 10 and Reading Question 12 due tonight. • Homework 11 and Reading Question 13 due Thursday. • Final exam information on website. Phys 1240: Sound and Music
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The speed of sound in helium gas is considerably higher than 344 m/s. If I fill a tube with helium, what will happen to the fundamental tone produced by that tube? A) Goes up in pitch B) Goes down in pitch C) Stays about the same Clicker question
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Open tubes overpressure L
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Open tubes overpressure N=2, the 2nd harmonic in the tube L
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Pressure waves “fit” in the open tube n ( /2) = L Since f = v, f n = n (v/2L) Usual harmonics - same modes as a string!
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www.physics.smu.edu/~olness/www/05fall1320/applet/pipe-waves.html
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This note was uploaded on 08/24/2010 for the course PHYS 1240 taught by Professor Holland,murray during the Spring '08 term at Colorado.

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lecture24_th4_15 - Clicker question What is v in the...

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