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 he 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 arc initially separated by r i = 1.20 m. If the background noise increases by Δ β = 5 dB, the sound level at your listener must also increase. What separation r f i s then required?
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 he 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 arc initially separated by r i = 1.20 m. If the background noise increases by Δ β = 5 dB, the sound level at your listener must also increase. What separation r f i s then required?
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 he 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 arc initially separated by ri = 1.20 m. If the background noise increases by Δβ = 5 dB, the sound level at your listener must also increase. What separation rf is then required?
A student connects a speaker to the signal generator and sets the frequency to 500 Hz. He notices that the sound coming from a resonance tube gets noticeably louder at the lengths 85.5 cm and 119.8 cm but at not any lengths between. Using these values, calculate ΔL. Using ΔL, calculate wavelength λ. Finally, calculate the speed of sound.
The acoustical system shown in Figure P14.38 is driven by a speaker emitting sound of frequency 756 Hz. (a) If constructive interference occurs at a particular instant, by what minimum amount should the path length in the upper U-shaped tube be increased so that destructive interference occurs instead? (b) What minimum increase in the original length of the upper tube will again result in constructive interference?
The speaker system at an open-air rock concert forms a ring around the entire circular stage and delivers 60,000 W of power output. Assume the sound radiates in all directions equally as if it were generated by an isotropic point source and assume the sound energy is not absorbed by air.
(a) At what distance is the sound from the speakers barely audible? Note that your answer will be far too large since the model we are using for sound level ignores the power absorbed by the medium (air). mHow does your answer compare to the radius of the Earth?
dspeakers
rEarth
=
(b) What is the closest distance audience members can be to the speakers if the sound is not to be painful to their ears? m
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