Part A Residents of Hawaii are warned of the approach of a tsunami by sirens mounted on the top of towers. Suppose a siren produces siren. What is the power output of the siren? (enter your answer with 2 significant figures) sound that has a decibel level of 128 dB at a distance of 2.0 m from the possibly useful: B = 10 log(lo) B2 - B1 = 10 log(124) lo = 1012 W/m? I= PIA = P/4r2 Submit Request Answer Part B What is the decibel level 10.0m from the siren? (enter your answer with 3 significant figures) V AEO dB

College Physics
11th Edition
ISBN:9781305952300
Author:Raymond A. Serway, Chris Vuille
Publisher:Raymond A. Serway, Chris Vuille
Chapter1: Units, Trigonometry. And Vectors
Section: Chapter Questions
Problem 1CQ: Estimate the order of magnitude of the length, in meters, of each of the following; (a) a mouse, (b)...
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Part A
Residents of Hawaii are warned of the approach of a tsunami by sirens mounted on the top of towers. Suppose a siren produces a sound that has a decibel level of 128 dB at a distance of 2.0 m from the
siren. What is the power output of the siren? (enter your answer with 2 significant figures)
possibly useful:
B = 10 log(1/lo)
%3D
B2 - B1 = 10 log(12/)
%3D
lo = 10-12 W/m2
| = P/A = P/4ru²
2/1 = (ry/r2)?
Vη ΑΣφ
W
Submit
Request Answer
Part B
What is the decibel level 10.0 m from the siren? (enter your answer with 3 significant figures)
AEO
|] ?
dB
Transcribed Image Text:Part A Residents of Hawaii are warned of the approach of a tsunami by sirens mounted on the top of towers. Suppose a siren produces a sound that has a decibel level of 128 dB at a distance of 2.0 m from the siren. What is the power output of the siren? (enter your answer with 2 significant figures) possibly useful: B = 10 log(1/lo) %3D B2 - B1 = 10 log(12/) %3D lo = 10-12 W/m2 | = P/A = P/4ru² 2/1 = (ry/r2)? Vη ΑΣφ W Submit Request Answer Part B What is the decibel level 10.0 m from the siren? (enter your answer with 3 significant figures) AEO |] ? dB
Part C
How far away can the average person just barely hear the siren? (use the answer to Part A and enter your answer with 1 significant figure)
ΑΣφ
|] ?
km
Submit
Request Answer
Part D
How many additional sirens would need to be added to the tower to increase the decibel level to 131 dB at a distance of 2.0 m? (enter your answer with 1 significant figure)
Πν ΑΣφ
Submit
Request Answer
Transcribed Image Text:Part C How far away can the average person just barely hear the siren? (use the answer to Part A and enter your answer with 1 significant figure) ΑΣφ |] ? km Submit Request Answer Part D How many additional sirens would need to be added to the tower to increase the decibel level to 131 dB at a distance of 2.0 m? (enter your answer with 1 significant figure) Πν ΑΣφ Submit Request Answer
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