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
Properties of sound
A sound wave is a mechanical wave (or mechanical vibration) that transit through media such as gas (air), liquid (water), and solid (wood).
Quality Of Sound
A sound or a sound wave is defined as the energy produced due to the vibrations of particles in a medium. When any medium produces a disturbance or vibrations, it causes a movement in the air particles which produces sound waves. Molecules in the air vibrate about a certain average position and create compressions and rarefactions. This is called pitch which is defined as the frequency of sound. The frequency is defined as the number of oscillations in pressure per second.
Categories of Sound Wave
People perceive sound in different ways, like a medico student takes sound as vibration produced by objects reaching the human eardrum. A physicist perceives sound as vibration produced by an object, which produces disturbances in nearby air molecules that travel further. Both of them describe it as vibration generated by an object, the difference is one talks about how it is received and other deals with how it travels and propagates across various mediums.
![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](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fe3e68242-5a91-4b54-b664-0ff90b744d38%2F5a9874a6-ec77-4b83-9244-88ece5f1c076%2Fz6tr6bo_processed.jpeg&w=3840&q=75)
![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](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fe3e68242-5a91-4b54-b664-0ff90b744d38%2F5a9874a6-ec77-4b83-9244-88ece5f1c076%2Fx52qca_processed.jpeg&w=3840&q=75)
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