lecture7_tu2_1

lecture7_tu2_1 - Clicker question When sound travels from a...

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When sound travels from a source to a listener, what do air molecules never do? A. Travel from the source to the listener at 344 m/s B. Move back and forth with the frequency of the sound wave C. Bump into other air molecules D. Move in the direction of wave propagation E. Air molecules do all of the above Clicker question
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Today’s song • “Ode to Joy”, composed by Beethoven • Played on the power drill instrument
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www.colorado.edu/physics/phys1240 LAST TIME: waves and oscillations TODAY: simple harmonic motion NEXT TIME: Finish SHM, sources of sound READ : Ch. 3.2-3.3, Ch 3 notes. • Homework 3 and Reading Question 3 due Thursday night. • Exam 1 is next Thursday. – Practice exam posted on course website! – No answers will be posted. Phys 1240: Sound and Music
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If a big collision occurs in deep, empty outer space (two asteroids crash into one another, surrounded by vacuum), does it make a sound? A) Yes B) Yes (if there’s an astronaut there to hear it) C) No . Clicker question
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“In space no one can hear you scream” (“Alien” ads, 1979) Demo: bell in a vacuum chamber
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lecture7_tu2_1 - Clicker question When sound travels from a...

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