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week 6a

# week 6a - Physics 1240 Tues Outline Exam I recap Intensity...

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Physics 1240 Tues 2/17/2011 Outline Exam I recap Intensity Logarithmic scales SIL – dBs Relative versus absolute dB scales

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0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 33.30 37.52 41.74 45.95 50.17 54.39 58.61 62.83 67.04 71.26 75.48 79.70 83.92 88.13 92.35 96.57 Frequency Total PHYS 1240 PARKER EXAM 1 2/15/11 Median: 66 Mean:67 Curve: 77 and above A 67 and above B 57 and above C 49 and above D
Amplitude Compression Rarefaction P A

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Intensity Intensity is the amount of energy hitting a certain area in a certain time Intensity is proportional to the square of the pressure amplitude If we double the amplitude , then we quadruple the intensity I = 0.01 W/m 2 I = 0.04 W/m 2
CQ 6.1 I’ve measured the intensity of sound waves from two sources, A = 1 W/m 2 and B = 9 W/m 2 The amplitude of the sound wave from source B is: a) 3 times larger than that from source A b) 8 times larger than that from source A c) 2 times larger than that from source A

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• The intensity of source B is 9 times larger than that of source A • Intensity is proportional to the square of the amplitude, so the amplitude of B is 3 times larger
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week 6a - Physics 1240 Tues Outline Exam I recap Intensity...

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