2. Knight P16.39 The sound intensity level 5.00 m from a power saw is 100 dB. At what distance will the sound be a more tolerable 80 dB?

Physics for Scientists and Engineers: Foundations and Connections
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Author:Katz, Debora M.
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Chapter18: Superposition And Standing Waves
Section: Chapter Questions
Problem 20PQ
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Help with the following question question 2 The second photo is only equations
Useful information
Intensity of a spherical wave
Sound intensity level
f+=
I=
I
B = (10 dB) log10
10-1
-12 W/m²
Doppler effect: source approaching observer
P
4πr²
1- Usource/Usound
Doppler effect: source receding from observer
f_=
fo
1+ Usource/Usound
Doppler effect: observer approaching source
f+ = fo (1 + Vobserver/Usound)
Doppler effect: observer receding from source
f- = fo (1-Vobserver/Usound)
Ans
12353
Transcribed Image Text:Useful information Intensity of a spherical wave Sound intensity level f+= I= I B = (10 dB) log10 10-1 -12 W/m² Doppler effect: source approaching observer P 4πr² 1- Usource/Usound Doppler effect: source receding from observer f_= fo 1+ Usource/Usound Doppler effect: observer approaching source f+ = fo (1 + Vobserver/Usound) Doppler effect: observer receding from source f- = fo (1-Vobserver/Usound) Ans 12353
1. Knight P16.29 A circular wave travels outward
from the origin. At one instant in time the phase
at ri = 20 cm is 0 rad, and the phase at r2 = = 80
cm is 37 rad. What is the wavelength of the wave?
2. Knight P16.39 The sound intensity level 5.00 m
from a power saw is 100 dB. At what distance will
the sound be a more tolerable 80 dB?
3. Knight P16.41 An opera singer in a convertible
sings a note at 600 Hz while cruising down a
highway at 90 km/h. What is the frequency heard
by
(a) a person standing beside the road in front of
the car,
a person on the ground behind the car?
Transcribed Image Text:1. Knight P16.29 A circular wave travels outward from the origin. At one instant in time the phase at ri = 20 cm is 0 rad, and the phase at r2 = = 80 cm is 37 rad. What is the wavelength of the wave? 2. Knight P16.39 The sound intensity level 5.00 m from a power saw is 100 dB. At what distance will the sound be a more tolerable 80 dB? 3. Knight P16.41 An opera singer in a convertible sings a note at 600 Hz while cruising down a highway at 90 km/h. What is the frequency heard by (a) a person standing beside the road in front of the car, a person on the ground behind the car?
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