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November 26, 2014

Search: physics - sound level

Number of results: 64,742

physics
Factory Worker A is exposed to a sound of a constant intensity of 6.30 104 W m2 at a distance of 1.00 m from a noisy machine. The frequency of the sound is 4.00 kHz. (a) What is the sound level in decibels (dB) of this sound? (b) By what factor would the amplitude of this ...
June 12, 2011 by nancy

physics - sound level
The source of a sound wave has a power of 2.50 W. Assume it is a point source. (a) What is the intensity 6.70 m away? I used I = Power / 4*pi*r^2 and found I to be 4.43x10^-9 W/m^2 (b) What is the sound level at that distance? Sound level = 10 dB*log [(Intensity)/(Intensity ...
April 21, 2007 by COFFEE

physics
(a) By what factor is one sound more intense than another if the sound has a level 17.0 dB higher than the other? (b) If one sound has a level 32.0 dB less than another, what is the ratio of their intensities?
July 31, 2013 by Justin

physics
(a) By what factor is one sound more intense than another if the sound has a level 17.0 dB higher than the other? (b) If one sound has a level 32.0 dB less than another, what is the ratio of their intensities?
July 31, 2013 by Justin

physics
(a) By what factor is one sound more intense than another if the sound has a level 17.0 dB higher than the other? (b) If one sound has a level 32.0 dB less than another, what is the ratio of their intensities?
August 1, 2013 by Justin

physics sound
1. A stone is dropped from rest into a well. The sound of the splash is heard exactly 1.50 s later. Find the depth of the well if the air temperature is 10.0C. 2. Calculate the sound level in decibels of a sound wave that has an intensity of 2.25 W/m2
April 17, 2008 by Chris Adison

science (physics)
1) Why is frequency an element needed in the sound industry? and 2) When there is a sound pressure level of two different sources with different frequencies, why do sound pressure levels have to be determined in each seperate frequency? 1) The sound industry sells equipment ...
September 21, 2006 by Kat

physics
A grade-school teacher insists that the the overall sound level in his classroom not exceed 64 dB at his location. There are 25 students in his class. If each student talks at the same intensity level, and they all talk at once, what is the highest sound level at which each ...
April 5, 2011 by chris giordano

Physics
You're at a concert at a distance of 10m away from the band and their sound level is 120dB. How far back do you have to move if you want the sound level to be 85 dB? I tried using 85=(10/r1)^2, but this doesn't seem to be working.
October 22, 2008 by Ziyi

physics
the intensity level of a sound A is5dB greater than that of sound B and 3dB less than that of C. determine the ratio (Ic/Ib) of the intensity of sound C to that of sound B.
October 13, 2014 by ntethelelo

Physics(Please help)
The intensity (in W/m2) of one sound is 4.83 times as great as the intensity of another sound. Relative to the quieter sound, what is the intensity level of the louder sound? I am not sure how to start this. Thank you.
June 21, 2012 by Hannah

Physics SOUND
What is the resultant sound level when an 80-dB and an 85-dB sound are heard simultaneously?
May 3, 2008 by Anonymous

Physics- Elena please help!
An interstate highway has been built though a poor neighborhood in a city. In the afternoon, the sound level in a rented room is 114.0 dB as 172 cars pass outside the window every minute. (a) What is the sound intensity during the day ? (Reminder: If you choose to use ...
December 5, 2012 by Mary

physics
19 cars in a circle at a boom box competition produce a 130 dB sound level at the center of the circle. What is the average sound level(dB) produced there by each, assuming interference effects can be neglected?
July 31, 2013 by Justin

physics
19 cars in a circle at a boom box competition produce a 130 dB sound level at the center of the circle. What is the average sound level(dB) produced there by each, assuming interference effects can be neglected?
July 31, 2013 by Justin

physics
19 cars in a circle at a boom box competition produce a 130 dB sound level at the center of the circle. What is the average sound level(dB) produced there by each, assuming interference effects can be neglected?
August 1, 2013 by Justin

Physics
18 cars in a circle at a boom box competition produce a 105 dB sound level at the center of the circle. What is the average sound level produced there by each, assuming interference effects can be neglected? dB = ?
February 8, 2014 by ddsMom

physics
1. A stone is dropped from rest into a well. The sound of the splash is heard exactly 1.50 s later. Find the depth of the well if the air temperature is 10.0C. 2. Calculate the sound level in decibels of a sound wave that has an intensity of 2.25 W/m2
April 18, 2008 by Chris Adison

physics repost
1. A stone is dropped from rest into a well. The sound of the splash is heard exactly 1.50 s later. Find the depth of the well if the air temperature is 10.0C. 2. Calculate the sound level in decibels of a sound wave that has an intensity of 2.25 W/m2
April 19, 2008 by chris adison

Physics
The intensity due to a number of indipendent sound sources is the sum of the individual intensities. A) When four quadruplets cry simultaneously, how many decibels greater is the sound intensity level than when a single one cries? B) To increase the sound intensity level again...
March 29, 2008 by Amanda

physics
The sound level in decibels is typically expressed as β = 10 log (I/I0), but since sound is a pressure wave, the sound level can be expressed in terms of a pressure difference. Intensity depends on the amplitude squared, so the expression is β = 20 log (P/P0), where ...
November 16, 2011 by maria

physics
The sound level in decibels is typically expressed as β = 10 log (I/I0), but since sound is a pressure wave, the sound level can be expressed in terms of a pressure difference. Intensity depends on the amplitude squared, so the expression is β = 20 log (P/P0), where ...
November 16, 2011 by melisa

physics
The sound level in decibels is typically expressed as β = 10 log (I/I0), but since sound is a pressure wave, the sound level can be expressed in terms of a pressure difference. Intensity depends on the amplitude squared, so the expression is β = 20 log (P/P0), where ...
November 17, 2011 by maria

Physics - okay, turns out I need help once more
but this is the last problem, so I'll be done after thins one. :) You're at a concert at a distance of 10m away from the band and their sound level is 120dB. How far back do you have to move if you want the sound level to be 85 dB? I tried using 85=(10/r1)^2, but this doesn't ...
October 21, 2008 by Ziyi

physics
19 cars in a circle at a boom box competition produce a 130 dB sound level at the center of the circle. What is the average sound level(dB) produced there by each, assuming interference effects can be neglected? Please someone help me to solve this problem. Thanks a lot.
August 2, 2013 by Justin

Physics of Sound
For a speaker whose sound power output is 140 dB, the distance from the speaker at which the sound level will be reduced to 85 dB is ?
October 25, 2012 by Kristen

physics
The human eardrum has an area of 5.0105 m2. (a) What is the sound power received when the incident intensity is the minimum perceivable, 1.01012 W/m2? (b) What is the sound power at the eardrum for conversational speech, which has a sound level of 65 dB? (c) What is the ...
April 5, 2011 by janine ricca

Physics
This time I have two questions: #1.A recording engineer works in a soundproofed room that is 49.7 dB quieter than the outside. If the sound intensity in the room is 2.66 x 10-10 W/m2, what is the intensity outside? #2.A listener increases his distance from a sound source by a ...
December 5, 2006 by Jena

physics
A loudspeaker is placed between two observers who are 114 m apart, along the line connecting them. If one observer records a sound level of 61.6 dB and the other records a sound level of 81.3 dB, how far is the speaker from each observer?
December 2, 2008 by Anonymous

physics
A loudspeaker is placed between two observers who are 111 m apart, along the line connecting them. If one observer records a sound level of 51.9 dB and the other records a sound level of 82.5 dB, how far is the speaker from each observer?
November 30, 2010 by Linda

Physics- PLEASE HELP
An interstate highway has been built though a poor neighborhood in a city. In the afternoon, the sound level in a rented room is 114.0 dB as 172 cars pass outside the window every minute. Late at night, the traffic flow is only 7 cars per minute. (b) What is the sound ...
December 6, 2012 by Anonymous

Physics- Elena please help!
An interstate highway has been built though a poor neighborhood in a city. In the afternoon, the sound level in a rented room is 114.0 dB as 172 cars pass outside the window every minute. Late at night, the traffic flow is only 7 cars per minute. (b) What is the sound ...
December 6, 2012 by Anonymous

physics repost
Calculate the sound level in decibels of a sound wave that has an intensity of 2.25 W/m2. F
April 19, 2008 by chris adison

alg 2
The sound level in decibles, B, can be found using the equation B=10 log(I/10^-12). what is the sound intensity when the decible level is 90? pleaseeeeeeeeeeee helppppppppppppppppppp
June 16, 2008 by URGENT!!!!!!!!!

College Physics
A vacuum cleaner has a measured sound level of 75.7 dB. What is the intensity of this sound? Answer in units of W/m^2
December 7, 2010 by Tammi

physics
The amplitude of a sound wave is measured in terms of its maximum gauge pressure. By what factor does the amplitude of a sound wave increase if the sound level goes up by 38.0 dB?
July 31, 2013 by Justin

physics
The amplitude of a sound wave is measured in terms of its maximum gauge pressure. By what factor does the amplitude of a sound wave increase if the sound level goes up by 38.0 dB?
July 31, 2013 by Justin

physics
The amplitude of a sound wave is measured in terms of its maximum gauge pressure. By what factor does the amplitude of a sound wave increase if the sound level goes up by 38.0 dB?
August 1, 2013 by Justin

physical sciences
a thunderclap 200m away delivers 3.75E^-5 W/m^2 of sound. What is the sound level in decibels? What is the intensity of the sound at 10m from the thunderclap? What is the sound level in decibels 10m from the thunderclap?
October 21, 2008 by Valerie

college physics
The sound level when one child is talking in a room is 60.0 dB. What would be the sound level if all 20 children talk at the same time in the same room? Assume each child talks equally loudly.
January 18, 2014 by bano

Physics
Two sounds have measured intensities of I1 = 100 W/m2 and I2 = 300 W/m2. By how many decibels is the level of sound 1 lower than that of sound 2?
March 19, 2011 by Jane

physics
1.) The average sound intensity inside a busy neighborhood restaurant is 3.*10^-5 W/M^2. How much energy goes into each ear (area = 2.1 * 10^-2 m^2) during a one hour meal? 2.) A member of an aircraft maintenance crew wears protective earplugs that reduce the sound intensity ...
December 12, 2010 by David

Math
Log functions: A new car has an interior sound level of 70 dB at 50 km h. A second car, at the same speed, has an interior sound level that is two times more intense than that of the new car. Calculate the sound level inside the second car.
May 27, 2011 by Aimee

physics
Sound is passing perpendicularly through an open window whose dimensions are 1.1 m  0.75 m. The sound intensity level is 95 dB above the threshold of hearing. How much sound energy comes through the window in one hour?
January 13, 2013 by not sure

Physics
A spherical source radiates sound uniformly in all directions. At a distance of 12 m, the sound intensity level is 100 dB. At what distance from the source is the intensity level 40 dB? When I set it up as 100dB/40dB = r^2/(12m)^2, and got x = 18.97 meters, i was told this ...
October 22, 2013 by T

Physics
A spherical source radiates sound uniformly in all directions. At a distance of 12 m, the sound intensity level is 100 dB. At what distance from the source is the intensity level 40 dB? When I set it up as 100dB/40dB = r^2/(12m)^2, and got x = 18.97 meters, i was told this ...
October 22, 2013 by T

Physics
A spherical source radiates sound uniformly in all directions. At a distance of 12 m, the sound intensity level is 100 dB. At what distance from the source is the intensity level 40 dB? When I set it up as 100dB/40dB = r^2/(12m)^2, and got x = 18.97 meters, i was told this ...
October 22, 2013 by T

physics
The sound of heavy automobile traffic, heard at a certain distance, has a sound level of about 75 dB. What is the intensity of the noise there? answer in W/m^2.
April 5, 2011 by kait morgan

physics
Two sounds have measured intensities of I1 = 102 W/m2 and I2 = 408.00 W/m2. By how many decibels is the level of sound 1 lower than that of sound 2? Answer in dB
November 24, 2014 by May

Physics
Hi I am absolutely stumped on this question. A loudspeaker is placed between two observers who are 110 m apart, along the line connecting them. If one observer records a sound level of 60.1 dB and the other records a sound level of 74.9 dB, how far is the speaker from each ...
November 28, 2008 by Joey

Physics
Hi I am absolutely stumped on this question. A loudspeaker is placed between two observers who are 110 m apart, along the line connecting them. If one observer records a sound level of 60.1 dB and the other records a sound level of 74.9 dB, how far is the speaker from each ...
November 28, 2008 by Joey

Physics
Hi I am absolutely stumped on this question. A loudspeaker is placed between two observers who are 110 m apart, along the line connecting them. If one observer records a sound level of 60.1 dB and the other records a sound level of 74.9 dB, how far is the speaker from each ...
November 28, 2008 by Joey

Physics
Hi I am absolutely stumped on this question. A loudspeaker is placed between two observers who are 110 m apart, along the line connecting them. If one observer records a sound level of 60.1 dB and the other records a sound level of 74.9 dB, how far is the speaker from each ...
November 28, 2008 by Joey

Reading Comp.
The modern hearing aid is, essentially, a miniature public-address system, which converts sound into electrical energy and then converts it back to sound again. A hearing aid can increase the sound level by sixty decibels or more, but it also distorts the sound to some extent...
March 28, 2011 by Arlynn

Physics HELP!!
A loudspeaker is placed between two observers who are 113m apart, along the line connecting them. If one observer records a sound level of 51.8dB and the other records a sound level of 75.8dB, how far is the speaker from each observer? Enter the longest distance first.
November 30, 2012 by Angie

Physics
1. What is the intensity of a sound at the pain level of 120 dB? 2. What is the intensity level of a sound whose intensity is 2.0 x 10^-6 W/m^2?
May 29, 2010 by Amber

Physics - Please Help
A 60 year old person has a threshold of hearing of 81.0 dB for a sound with frequency f=10,000 Hz. By what factor must the intensity of a sound wave of that frequency, audible to a typical young adult, (sound level=43.0 dB) be increased so that it is heard by the older person...
April 25, 2011 by Emily

physics
if you continue to lower the water level after recording length at the first sound resonance at fixed tuning fork frequency, you will hear the sound again but the sound gets louder(seond resonance). at this point, by what factor has length increased? why?
July 31, 2013 by fakhrul

physics
At a distance of 7.5 m from a point sound source, the sound intensity level is 105 dB. At what distance is the intensity level 90 dB?
April 13, 2012 by Anonymous

physics
An electronic point source emits sound isotropically at a frequency of 3000 Hz and a power of 34 watts. A small microphone has an area of 0.75 cm2 and is located 158 meters from the point source. a) What is the sound intensity at the microphone ? To find intensity i tried I=...
April 21, 2010 by caleb

Algebra
The Occupational Safety and health Administration (OSHA) estblished permissible sound exposures in the work-place. This is modeled by the equation: S=-2.817H + 108.9 Use the formula for the problem: S=maximun permissible sound level in decibels H=number of hours of exposure ...
February 8, 2008 by G

Algebra
The Occupational Safety and health Administration (OSHA) estblished permissible sound exposures in the work-place. This is modeled by the equation: S=-2.817H + 108.9 Use the formula for the problem: S=maximun permissible sound level in decibels H=number of hours of exposure ...
February 8, 2008 by G

Physics - sound
When wearing proper ear protection, a jack hammer operator experiences a sound intensity of 1x10^-6 W/m2. The ear protection purpots to reduce the sound intensity by 100 times. What is the actual sound level of the jack hammer?
January 15, 2011 by Anonymous

Functions
Problem solving with logarithmic functions: A new car has an interior sound level of 70 dB at 50 km h. A second car, at the same speed, has an interior sound level that is two times more intense than that of the new car. Calculate the sound level inside the second car.
May 26, 2011 by Aimee

Physics Experiment
In the experiment Standing Waves,if you continue to lwer the water level after recording l(m) at the first sound resonance at fixed tuning fork frequency, you will hear the sound again but sound gets louder (second resonance). At this point, by what factor has l(m) increased? ...
July 11, 2013 by khadijah

Physics
As measured from centre ice, a single wildly cheering hockey fan can produce a sound intensity level of 60dB. What sound intensity level would be produced by 20 000 cheering fans? --------- If sound waves travel through the ground with an average speed of 6150 m/s and a ...
May 15, 2012 by HelpMeWithPhysics

physics
A member of an aircraft maintenance crew wears protective earplugs that reduce the sound intensity by a factor of 355. When a jet aircraft is taking off, the sound intensity level experienced by the crew member is 72 dB. What sound intensity level would the crew member ...
December 3, 2011 by Marco

physics
A student in the front row of a concert is at a distance of 2 m from the speaker. They hear the sound at 140dB. What is the sound intensity if the student walks 20 m away. What is the sound intensity at 2 m if there are 100 speakers at the same level at the same time instead ...
May 31, 2011 by marinana

STUPID PHYSICS
As measured from centre ice, a single wildly cheering hockey fan can produce a sound intensity level of 60dB. What sound intensity level would be produced by 20 000 cheering fans? --------- If sound waves travel through the ground with an average speed of 6150 m/s and a ...
May 15, 2012 by HelpMeWithPhysics

PHYSICS
At 25 m from a sound source, the intensity level is 55 dB. What's the level at distance of 56m? What's the level at distance of 273m?
July 16, 2012 by jR

Physics
A jet engine produces a sound level of 150 dB from a distance of 30 m (assuming spherical dissipation). The average human ear has an effective area of 12.0 cm2. What is the sound level at 60 m from a jet engine is? What would the power intercepted by an unprotected ear at 60 m...
May 27, 2014 by Teagan

Physics
Sound is emitted by a point source. You wish to compare the sound intensity and sound intensity level from this source at two different sites. If the distance to the second site is a factor of 6 greater than the distance to the first, determine the following. (a) Determine the...
February 8, 2014 by ddsMom

Physics
Sound is emitted by a point source. You wish to compare the sound intensity and sound intensity level from this source at two different sites. If the distance to the second site is a factor of 6 greater than the distance to the first, determine the following. (a) Determine the...
February 8, 2014 by ddsMom

Physics URGENT!!!
A train sounds its horn as it approaches an intersection. The horn can just be heard at a level of 59 dB by an observer 14 km away. (a) What (b) What intensity level of the horns sound is observed by someone waiting at an intersection 46 m from the train? Treat the horn as a ...
December 4, 2012 by Tia

Physics URGENT!!!
A train sounds its horn as it approaches an intersection. The horn can just be heard at a level of 59 dB by an observer 14 km away. (a) What is the average power generated by the horn? (b) What intensity level of the horns sound is observed by someone waiting at an ...
December 6, 2012 by Anonymous

Physics
A train sounds its horn as it approaches an intersection. The horn can just be heard at a level of 42 dB by an observer 10 km away. (a) What is the average power generated by the horn? W (b) What intensity level of the horn's sound is observed by someone waiting at an ...
December 13, 2010 by Jake

college physics
If the amplitude of a sound wave is tripled, A.) by what factor will the intensity increase? B.) by how many dB will the sound level increase?
May 6, 2010 by A

Physics
Ten cars at an intersection are blowing their horns simultaneously, creating a 98 decibel sound in the middle of the intersection. What is the average sound level for each car?
March 20, 2014 by Paul

Physics
An underwater micriphone is used to record sounds emitted by porpoises. The minimum intensity level the instrument can record is 23.6dB. Assuming a porpoise emits sound at a rate of 0.0359J/s, what is the maximum distance at which the animal will still be recorded? Neglect ...
November 30, 2012 by rory

Physics
An underwater micriphone is used to record sounds emitted by porpoises. The minimum intensity level the instrument can record is 23.6dB. Assuming a porpoise emits sound at a rate of 0.0359J/s, what is the maximum distance at which the animal will still be recorded? Neglect ...
November 30, 2012 by rory

physics
An underwater micriphone is used to record sounds emitted by porpoises. The minimum intensity level the instrument can record is 30.9dB. Assuming a porpoise emits sound at a rate of 0.0603J/s, what is the maximum distance at which the animal will still be recorded? Neglect ...
April 9, 2013 by stuck

physics
An underwater micriphone is used to record sounds emitted by porpoises. The minimum intensity level the instrument can record is 30.9dB. Assuming a porpoise emits sound at a rate of 0.0603J/s, what is the maximum distance at which the animal will still be recorded? Neglect ...
April 9, 2013 by stuck

physics
An underwater micriphone is used to record sounds emitted by porpoises. The minimum intensity level the instrument can record is 30.9dB. Assuming a porpoise emits sound at a rate of 0.0603J/s, what is the maximum distance at which the animal will still be recorded? Neglect ...
April 9, 2013 by stuck

physics
An underwater micriphone is used to record sounds emitted by porpoises. The minimum intensity level the instrument can record is 30.9dB. Assuming a porpoise emits sound at a rate of 0.0603J/s, what is the maximum distance at which the animal will still be recorded? Neglect ...
April 9, 2013 by stuck

physics
An underwater micriphone is used to record sounds emitted by porpoises. The minimum intensity level the instrument can record is 30.9dB. Assuming a porpoise emits sound at a rate of 0.0603J/s, what is the maximum distance at which the animal will still be recorded? Neglect ...
April 9, 2013 by stuck

physics
An underwater micriphone is used to record sounds emitted by porpoises. The minimum intensity level the instrument can record is 30.9dB. Assuming a porpoise emits sound at a rate of 0.0603J/s, what is the maximum distance at which the animal will still be recorded? Neglect ...
April 9, 2013 by stuck

physics
Jane and Sam alternately pound a railroad spike into a tie with their hammers. The crew chief has a migraine, and notes that Jane's hammer blows cause a sound with intensity 5.0 times greater than the sound that Sam makes when he swings his hammer. What is the difference in ...
April 5, 2011 by shanelle james

physics
When I sing into a microphone, suppose I produce a sound intensity level (SIL) of 40 dB. If you can sing at 60 dB, what is the ratio of our produced sound intensities (yours divided by mine)?
April 1, 2010 by naomi

Sound engineering
A Question of engineering about Sound. How to calculate in step by step? Thank you. The octave bands Sound pressure levels in dB re 20 g Pa are: Hz 57 129 220 420 1K 2K 4K 8K dB 85 95 90 80 88 70 68 72 What is the overall A-weighted sound pressure level?
February 28, 2013 by Kelvin

Physics
Indicate true or false in each of the following statements: 1. a tube open at one end resonates with only odd harmonics 2. The frequency of a sound emitted by a vehicle as it moves toward you rises as you listen 3. a tube open at both ends resonates with all harmonics 4. an ...
May 8, 2008 by Katie

physics
In a pig-calling contest, a caller produces a sound with an intensity level of 110 dB. How many such callers would be required to reach the pain level of 120 dB?
November 26, 2011 by jazz

Physics
While peforming a concert , Queen plays at average intensity levels of 2 W/m^2. Then during a sudden loud part of the music, the amplitude of the sound waves , initially A1 increases by a factor of 5. By how many decibels does the sound level increase?
June 13, 2011 by Matt

Physics
1.The mass of a string is , and it is stretched so that the tension in it is 180 N. A transverse wave traveling on this string has a frequency of 260 Hz and a wavelength of 0.60 m. What is the length of the string? 2.A rocket engine emits of sound energy every second. The ...
December 6, 2006 by Jena

physics
Two speakers are separated by distance d1 = 2.40 m and are in phase. You are standing 3.00 m directly in front of one speaker. Each speaker has an output power of 1.20 W. Because the speakers are at different distances, there will be frequencies at which the sound from the ...
October 11, 2011 by Anonymous

physics
A source of sound (1000 Hz) emits uniformly in all directions. An observer 3.19 m from the source measures a sound level of 39.2 dB. Calculate the average power output of the source.
December 2, 2008 by Anonymous

physics
A source of sound (1200 Hz) emits uniformly in all directions. An observer 2.99 m from the source measures a sound level of 41.1 dB. Calculate the average power output of the source.
December 5, 2010 by Matt

physics
A source of sound (1200 Hz) emits uniformly in all directions. An observer 2.99 m from the source measures a sound level of 41.1 dB. Calculate the average power output of the source.
December 6, 2010 by Madeline

physics
A source of sound (1200 Hz) emits uniformly in all directions. An observer 2.99 m from the source measures a sound level of 41.1 dB. Calculate the average power output of the source.
December 6, 2010 by Madeline

Physics
An underwater microphone is used to record sounds emitted by porpoises. The minimum intensity level the instrument can record is 10 dB. Assuming a porpoise emits sound at a rate of 0.05 J/s, what will be the max distance at which the animal will still be recorded? Neglect ...
February 21, 2010 by Mitchell

Physics
A source of sound (1140Hz) emits uniformly in all directions. An observer 3.09m from the source measures a sound level of 38.2dB. Calculate the average power output of the source.
November 30, 2012 by Ann

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