HW15 - kuehner(rjk679 – HW15 – Mackie –(20211 1 This...

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Unformatted text preview: kuehner (rjk679) – HW15 – Mackie – (20211) 1 This print-out should have 7 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points Sound level β in decibels is defined as β ≡ 10 log parenleftbigg I I parenrightbigg , where I = 1 × 10 − 12 W / m 2 . The decibel scale intensity for busy traffic is 80 dB. Two people having a loud conversation have a deci- bel intensity of 70 dB. What is the approximate combined sound intensity? Answer in units of W / m 2 . 002 (part 1 of 2) 10.0 points Two sound sources radiating in phase at a fre- quency of 560 Hz interfere such that maxima are heard at angles of 0 ◦ and 20 ◦ from a line perpendicular to that joining the two sources. The velocity of sound is 340 m/s. y L d S 1 S 2 θ listening direction θ δ Assume: L ≫ d Find the separation between the two sources....
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