lecture 21 - beats, uncertainty

lecture 21 - beats, uncertainty - Announcements 2/23/11...

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Unformatted text preview: Announcements 2/23/11 Prayer Deron Williams just got traded to the Nets (what???) Due Saturday night: a. Labs 4-5 b. First extra credit papers - Can do each type of paper once in first half of semester, once in second half c. Term project proposals – Email to me: proposal in body of email, 650 word max. – One proposal per group… but please CC your partner(s) on email . – See website for guidelines, grading, ideas, and examples of past projects. Thanks to those who filled out the mid-semester survey Colton “Fourier series summary” handout. Caution about notation!! Demos Trumpet Gas-lit standing wave Reading Quiz As discussed in the reading assignment, a “beat” is: a. A periodic change in amplitude of a wave b. Interference between overtones c. The first Fourier component of a wave d. The reflection of a wave from a rigid barrier e. What the musical “Hairspray” says you can’t stop Beats Demo: Tuning forks; Spectrum lab software “beat frequency”: f beat = | f 1 – f 2 | “beat period” (or ϖ beat = | ϖ 1 – ϖ 2 | ) Beats, cont. Video: http://stokes.byu.edu/beats_script_flash.html Beats: Quick Math cos cos 2cos cos 2 2 a b a b a b +- + = ÷ ÷ ( 29 ( 29 cos(30 ) cos(31 )...
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lecture 21 - beats, uncertainty - Announcements 2/23/11...

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