As the number of people at a party increases,you must raise your voice for a listener to hear you againstthe background noise of the other partygoers. However, once youreach the level of yelling, the only way you can be heard is if youmove closer to your listener, into the listener’s “personal space.”Model the situation by replacing you with an isotropic point sourceof fixed power P and replacing your listener with a point that absorbspart of your sound waves.These points are initially separatedby ri=1.20 m. If the background noise increases by b=5 dB, thesound level at your listener must also increase.What separation rfis then required?

As the number of people at a party increases,you must raise your voice for a listener to hear you againstthe background noise of the other partygoers. However, once youreach the level of yelling, the only way you can be heard is if youmove closer to your listener, into the listener’s “personal space.”Model the situation by replacing you with an isotropic point sourceof fixed power P and replacing your listener with a point that absorbspart of your sound waves.These points are initially separatedby ri=1.20 m. If the background noise increases by b=5 dB, thesound level at your listener must also increase.What separation rfis then required?

University Physics Volume 1

18th Edition

ISBN:9781938168277

Author:William Moebs, Samuel J. Ling, Jeff Sanny

Publisher:William Moebs, Samuel J. Ling, Jeff Sanny

Chapter16: Waves

Section: Chapter Questions

Problem 77P: The low-frequency speaker of a stereo set has asurface area of A=0.05 m2 and produces 1 W of...

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The low-frequency speaker of a stereo set has asurface area of A=0.05 m2 and produces 1 W of acoustical power. (a) What is the intensity at the speaker? (b) If the speaker projects sound uniformly in all directions, at what distance from the speaker is the intensity 0.1 W/m2?
What is the minimum speed at which a source must travel toward you for you to be able to hear that its frequency is Doppler shifted? That is, what speed produces a shift of 0.300% on a day when the speed of sound is 331 m/s?
Energy from the Sun arrives at the top of Earth’s atmosphere with an intensity of 1400 W/m2. How long does it take for 1.80109 J to arrive on an area of 1.00 m2?
Party hearing. As the number of people at a party increases, you must raise your voice for a listener to hear you against the background noise of the other partygoers. However, once you reach the level of yelling, the only way you can be heard is if you move closer to your listener, into the listener's "personal space." Model the situation by replacing you with an isotropic point source of fixed power Pand replacing your listener with a point that absorbs part of your sound waves. These points are initially separated by r = 1.10 m. If the background noise increases by Aß = 4.50 dB, the sound level at your listener must also increase. What separation rț is then required? Number i Units
Party hearing. As the number of people at a party increases, you must raise your voice for a listener to hear you against the background noise of the other partygoers. However, once you reach the level of yelling, the only way you can be heard is if you move closer to your listener, into the listener's "personal space." Model the situation by replacing you with an isotropic point source of fixed power P and replacing your listener with a point that absorbs part of your sound waves. These points are initially separated by r; = 1.80 m. If the background noise increases by Aß = 5.20 dB, the sound level at your listener must also increase. What separation rț is then required? Number i Units
Party hearing. As the number of people at a party increases, you must raise your voice for a listener to hear you against the background noise of the other partygoers. However, once you reach the level of yelling, the only way you can be heard is if you move closer to your listener, into the listener's "personal space." Model the situation by replacing you with an isotropic point source of fixed power Pand replacing your listener with a point that absorbs part of your sound waves. These points are initially separated by r; = 1.70 m. If the background noise increases by AB = 5.10 dB, the sound level at your listener must also increase. What separation rț is then required? Number i Units
Imagine u are hiking along а trail wide, dryr canyon where thec outdoor temperature is T=25° C determine how, far you aret away fom the canyon wall, you yell: Bye" and hear the echo t= 2.45 s later. Then calculate the speed of that sound in m/s if the speed at 0° C is 330 m/s . Then how far are u from the canyon wall in m? If u stood at the same point on a cold day were T2 = -7.5 °C how long is have taken fou u to hear the echo in s?
A man makes a loud holler. He hear an echo 1s later. If the air temperature is 25 oC, how far is he from the source of the echo?
Suppose a bat uses sound echoes to locate its insect prey, 3.00 m away. (a) Calculate the echo times for temperatures of 5.00C and 35.0C. (b) What percent uncertainty does this cause for the bat in locating the insect? (c) Discuss the significance of this uncertainty and whether it could cause difficulties for the bat. (In practice, the bat continues to use sound as it closes in, eliminating most of any difficulties imposed by this and other effects, such as motion of the prey.)
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A crude approximation of voice production is to consider the breathing passages and mouth to be a resonating tube closed at one end. If the tube is 0.260 m long, by taking air temperature to be 37.0∘C? What would this frequency become if the person's breathing passage were filled with hydrogen instead of air? Assume the same temperature dependence for hydrogen as for air.