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Spring 2008  Phys 5A  4/28  Lecture 2.17  50 minutes
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"A composer is a guy who goes around forcing his 
will on unsuspecting air molecules, often with the 
assistance of unsuspecting musicians."
--Frank Zappa

TODAY (*.pdf)
Quiz 6: 9:30-9:55 AM
     **PLEASE SIT IN EVERY OTHER SEAT**
     **NO CELL PHONES/MEDIA PLAYERS/PDAS ALLOWED**
     USE YOUR OWN UNIQUE 4-DIGIT P.I.N.
     WRITE NAME AND P.I.N. ALONG EDGE OF QUIZ
     CIRCLE ALL ANSWERS DIRECTLY ON QUIZ
     FINISHED EARLY?  TURN IN QUIZ, BE CONSIDERATE AND QUIET

Chs. 11.2, 12.3: Sound Intensity and Level (*.pdf)
     Ex: Anechoic chamber
         (School of Computing, Science, and Engineering, 
          University of Salford, UK) 
     Ex: Problem 12.12 (extended, finish for homework)
     Ex: Problem 12.14 (conceptual)
     
Clicker opinion survey (optional anonymity)

NEXT TIME 
Homework
     (String standing waves)
     Problems 11.47 (for practice only)
              11.48
              11.52(a)-(b); (c) find _wavelength_ of sound waves
              11.53 (for practice only)
              11.54 (convert mg to kg first!)
              11.55 (for practice only)
              11.57 (for practice only)
     (Sound intensities/levels)
     Problems 11.3 (for practice only)
              12.12 (finish for 2.0 points)
              12.16 (assume an original level of 120 dB, find original I;
                     find new I for new level of 121 dB, then find % increase)

Read Ch. 12.4 (Figs. 12.3, 12.4; p. 428 "light-bulb" comment)
     Ch. 12.8 (p. 433 "light-bulb" comment; Eq. (12-14))