week 5a

# week 5a - Physics 1240 Tues Today Diffraction Sound...

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Unformatted text preview: Physics 1240 Tues 2/8/11 Today: Diffraction, Sound Intensity Next time: Review for Exam I Outline Scaling of physical quantities Diffraction Intensity Last time… Beats = 100 Hz 105 Hz f beats = f 1 – f 2 = 5 Hz P beats = 0.2 s f = 1 / P = 5 Hz Last time… Beats = 100 Hz 105 Hz f beats = f 1 – f 2 = 5 Hz P beats = 0.2 s f = 1 / P = 5 Hz (remember 1/s = 1 Hz) CQ 5.1 Two trombones play with the following frequencies: 185 Hz and 187.5 Hz. What is the period between beats? a) 0.5 Hz b) 1.25 Hz c) 2.5 Hz d) 0.4 sec e) 0.8 sec Scaling of physical quantities f = 1 / P Examples: 1) P goes up by a factor of 2 – f goes down by a factor of 2 2) f goes up by a factor of 2 – P drops by ½ or P goes down by a factor of 2 CQ 5.2 A complex periodic waveform has a period of 2 ms (milliseconds). What is the period of the 2 nd harmonic? a) 0.5 ms b) 1 ms c) 2 ms d) 500 Hz e) 250 Hz Scaling of physical quantities cont… Speed of sound: v = 344 + 0.6 x (T-20) T in o C v in m/s Example: T goes up – v goes up 0.6 m/s per o C CQ 5.3 CQ 5....
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week 5a - Physics 1240 Tues Today Diffraction Sound...

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