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July 24, 2014

Search: sound

Number of results: 2,605

physics
Factory Worker A is exposed to a sound of a constant intensity of 6.30 × 10–4 W m–2 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
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 10.0°C. 2. Calculate the sound level in decibels of a sound wave that has an intensity of 2.25 µW/m2
April 17, 2008 by Chris Adison

sound
a surface recieving sound is moved from its original position to a position three times farther away from the source of the sound. the intensity of the recieved sound thus becomes
July 23, 2009 by anita

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

Logarithms
Show that, if one sound is 10 decibels louder than a second sound, than the first sound is 10 times as intense as the second sound.
March 28, 2012 by Anonymous

Physics(Please respond)
A source emits sound uniformly in all directions. There are no reflections of the sound. At a distance of 12 m from the source, the intensity of the sound is 1.7 × 10-3 W/m2. What is the total sound power P emitted by the source? Would I do 1.7e^-3 (12) ?
June 20, 2012 by Hannah

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 â of the louder sound? I am not sure how to start this. Thank you.
June 21, 2012 by Hannah

Physics
1) A microphone has an area of 6.7 cm2. It receives during a 4.62 s time period a sound energy of 2.5x10-11 J. What is the intensity of the sound? 2) Using the intensity in the previous question, what is the variation of pressure in the sound wave if the speed of sound is 343 ...
November 22, 2010 by Bala

Physics
1) A microphone has an area of 6.7 cm2. It receives during a 4.62 s time period a sound energy of 2.5x10-11 J. What is the intensity of the sound? 2) Using the intensity in the previous question, what is the variation of pressure in the sound wave if the speed of sound is 343 ...
November 22, 2010 by Bala

Physics
1) A microphone has an area of 6.7 cm2. It receives during a 4.62 s time period a sound energy of 2.5x10-11 J. What is the intensity of the sound? 2) Using the intensity in the previous question, what is the variation of pressure in the sound wave if the speed of sound is 343...
November 22, 2010 by Bala

English expression
e. I'm glad to meet you. 'glad to' is pronounced as a linking sound like one word. In these words, the d is a voiced sound, and the t is a voiceless sound. However the articulation points are the same. In this case, the d sound is dropped. Meet you is pronounced as a linking ...
March 6, 2008 by John

Physics
The wavelength in air of a sound is 5 m. (a) What is the frequency of the sound? Sound can have any frequency. It is the SPEED of sound that remains constant, independent of frequency, at a given temperature.
March 1, 2007 by Courtney

Physics
The distance between a loudspeaker and the left ear of a listener is 2.19 m. (a) Calculate the time required for sound to travel this distance taking the speed of sound to be 343 m/s. (b) Assuming that the sound frequency is 525 Hz, how many wavelengths of sound are contained ...
March 3, 2013 by Tim

Algebra 2
Since sound is generated by vibrations and travels in waves it can be modeled by trigonometric functions. When an object vibrates twice as fast, it produces a sound with a pitch one octave higher than before. Amplitude is associated with loudness. Suppose a sound can be ...
May 6, 2011 by Don't wanna get caught!

Algebra 2
Can someone help me? I'm really confused. The loudness L of a sound in decibels is given by L= 10log(base10)R, where R is the sound's relative intensity. If the intensity of a certain sound is tripled, by how many decibels does the sound increase?
March 1, 2010 by Ana

algebra 2
the loudness L of a sound in decibels is given L=10log10R, where R is the sound's relative intensity. if the intensity of a certain sound is tripled, by how many decibels does the sound increase? due tomorrow, tuesday, april 5th, 2011. help pleaseeeee ;)
April 4, 2011 by math challenged

physics
Two loudspeakers emit sound waves along the x-axis. The sound has maximum intensity when the speakers are 14.0 cm apart. The sound intensity decreases as the distance between the speakers is increased, reaching zero at a separation of 54.0 cm. What is the wavelength of the ...
December 2, 2008 by Anonymous

physics
Two loudspeakers emit sound waves along the x-axis. The sound has maximum intensity when the speakers are 14.0 cm apart. The sound intensity decreases as the distance between the speakers is increased, reaching zero at a separation of 54.0 cm. What is the wavelength of the sound?
December 2, 2008 by Anonymous

physics
Two loudspeakers emit sound waves along the x-axis. The sound has maximum intensity when the speakers are 14.0 cm apart. The sound intensity decreases as the distance between the speakers is increased, reaching zero at a separation of 54.0 cm. What is the wavelength of the sound?
December 2, 2008 by Anonymous

Physics
what is the variation of pressure in the sound wave if the sound intensity is 3.85x10^-8 W/m^2, the speed of sound is 343 m/s and the density of air is 1.2 kg/m3?
November 21, 2010 by Mike

physics
what is the variation of pressure in the sound wave if the sound intensity is 3.85x10^-8 W/m^2, the speed of sound is 343 m/s and the density of air is 1.2 kg/m3?
November 21, 2010 by Mike

Physics
what is the variation of pressure in the sound wave if the sound intensity is 3.85x10^-8 W/m^2 the speed of sound is 343 m/s and the density of air is 1.2 kg/m3?
November 22, 2010 by Jill

Ela
What are 2 things that make the zoom sound ,meow sound ,and ding dong sound ?
October 8, 2013 by Anabelle

Phys Sci
A sound is traveling through air with a temperature of 35 0C. The sound wave has a wavelength of 0.75 meters. What is the frequency of the sound? How do I calculate this problem?
May 31, 2011 by LinWa

physics
in a experiment to measure the speed of sound in glass, a pulse of sound is sent into a glass rod, 14 m in length. the reflected sound is detected after 5.6 ms (0.0056 s). calculate the speed of sound in glass.
January 19, 2014 by jack

physics
Ige confused, the truck driver sound the horn of the truck, which has a frequency of 260HZ. The speed of sound in air is 340m/s. an observer hears the sound while traveling in a bus toward the truck at a speed of 30m/s. a) what is the wavelength of the sound the whisle emits? ...
January 14, 2010 by guli

physics ..PLEASE HELP ASSIGN DUE SOON :(
A microphone has an area of 3.0cm^2. It receives during a 6.00s time period a sound energy of 1.0x10-11J. What is the intensity of the sound? b). Using the intensity in the previous question, what is the variation of pressure in the sound wave if the speed of sound is 343m/s ...
November 24, 2012 by sarah

when the energy of a sound wave is transferred to
when the energy of a sound wave is transferred to a particle of a medium and causes it to vibrate and generate heat, the sound wave is a. reflected b. refracted c. absorbed d. transmitted The pitch of the siren of a moving fire truck changes from high to low as the fire truck ...
June 2, 2014 by Helpmeplease

physics
The human eardrum has an area of 5.0×10–5 m2. (a) What is the sound power received when the incident intensity is the minimum perceivable, 1.0×10–12 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 SOUND
What is the resultant sound level when an 80-dB and an 85-dB sound are heard simultaneously?
May 3, 2008 by Anonymous

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

Sound engineering
A Question of engineering about Sound. How to calculate in step by step? Thank you. The octave bandsˇ¦ Sound pressure levels in dB re 20 Łg 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
An explosion occurs at the end of a pier. The sound reaches the other end of the pier by traveling through three media: air, fresh water, and a slender metal handrail. The speeds of sound in air, water, and the handrail are 355, 1410, and 5380 m/s, respectively. The sound ...
April 29, 2012 by chelsea

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 10.0°C. 2. Calculate the sound level in decibels of a sound wave that has an intensity of 2.25 µW/m2
April 18, 2008 by Chris Adison

Physics
A bat in a cave emits a sound pulse and receives an echo 0.15 second later. Assuming that the speed of sound is 345 m/s, how far did the sound (a longitudinal wave!) travel during this time?
February 4, 2014 by Anonymous

Physics
A bat emits a sound whose frequency is 83.2 kHz. The speed of sound in air at 20.0 oC is 343 m/s. However, the air temperature is 40.5 oC, so the speed of sound is not 343 m/s. Assume that air behaves like an ideal gas, and find the wavelength of the sound.
January 15, 2013 by Orla

physics
A bat emits a sound whose frequency is 83.6 kHz. The speed of sound in air at 20.0 oC is 343 m/s. However, the air temperature is 36.0 oC, so the speed of sound is not 343 m/s. Assume that air behaves like an ideal gas, and find the wavelength of the sound
January 21, 2013 by Anonymous

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 10.0°C. 2. Calculate the sound level in decibels of a sound wave that has an intensity of 2.25 µW/m2
April 19, 2008 by chris adison

science
What is the goal of surround sound? To get sound 360o. We hear sound naturally from ALL directions. The goal of surround sound is to make it sound as if it is coming from all directions.
February 6, 2007 by lost and confused

physics - sound level
The source of a sound wave has a power of 2.50 µW. 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 sonic boom is produced by an aircraft when it does which of the following? A) flies faster than sound continuously.B) None of these.C) All of these.D) first exceeds the speed of sound and breaks the sound barrier.E) pulls out of a subsonic dive.
April 29, 2012 by Kristie

Physics
Two loudspeakers emit sound waves along the x-axis. The sound has maximum intensity when the speakers are 35.9cm apart. The sound intensity decreases as the distance between the speakers is increased, reaching zero at a separation of 109.1cm. What is the wavelength of the ...
November 30, 2012 by joane

Physics Help, Please
Two speakers, A and B, are emitting identical, synchronized (in-phase) sound waves at 240kHz. A person standing a point C hears a relatively loud sound. She then starts walking towards point D, and notices the sound gets quieter, reaching a minimum when she arrives at D. The ...
November 12, 2012 by Michael

Physics Help, Please
Two speakers, A and B, are emitting identical, synchronized (in-phase) sound waves at 240kHz. A person standing a point C hears a relatively loud sound. She then starts walking towards point D, and notices the sound gets quieter, reaching a minimum when she arrives at D. The ...
November 13, 2012 by Michael

Physics Please Help!!
Two speakers, A and B, are emitting identical, synchronized (in-phase) sound waves at 240kHz. A person standing a point C hears a relatively loud sound. She then starts walking towards point D, and notices the sound gets quieter, reaching a minimum when she arrives at D. The ...
November 14, 2012 by Mike

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

Science
Could Some One Help Me With These Questions .. Filling The Gaps 1) A ________ sound has a large amplitude. 2) A _________ sound is produced by small vibrations. 3) A High Sound is produced by quick __________. thank you for the help .. x
February 22, 2009 by fern

Physics
One student generates a short, loud sound of wavelength 0.7576 m. Another student, who is 100 m away, hears the sound exactly 0.300 s later. What is the frequency of this sound? Please help
January 15, 2014 by unknown

physics
determine the following distances based on the sonar data given. a ship sends a sound pulse downward and receives the reflected sound 2.50 s later. use the formula d=vt. assume the speed of sound in sea water is 1540 m/s
October 1, 2010 by lorraine

Physics Lab Question, Help Please
Two speakers, A and B, are emitting identical, synchronized (in-phase) sound waves at 240kHz. A person standing a point C hears a relatively loud sound. She then starts walking towards point D, and notices the sound gets quieter, reaching a minimum when she arrives at D. The ...
November 12, 2012 by Kevin

physics
1)As a sound source moves away from a stationary observer, the number of waves will. decrease 2)How fast should a car move toward you for the car's horn to sound 2.88% higher in frequency than when the car is stationary? The speed of sound is 343 m/s. fs(v-vd/v-vs) 343(1/1-987...
April 6, 2008 by Jon

Physics
Organ pipes, open at one end, resonate best at their first resonant length. Two pipes have length 23.0 cm and 30.0 cm respectively. What is the wavelength of the sound emitted by each pipe? What are the respective frequencies if the speed of sound is 341 m/s? What is the air ...
November 5, 2008 by Sally

Physics Help, Please
The figure below shows two speakers, A and B, which are emitting identical, synchronized (in-phase) sound waves at 240kHz. A person standing a point C hears a relatively loud sound. She then starts walking towards point D, and notices the sound gets quieter, reaching a minimum...
November 12, 2012 by Michael

physics
A speaker is designed for wide dispersion for a high frequency sound. What should the diameter of the circular opening be for a speaker where the desired diffraction angle is 11° and a 9100 Hz sound is generated? The speed of sound is 343 m/s
December 13, 2011 by Anonymous

Physics
Directly below on the floor is a stationary 428-Hz source of sound. The microphone vibrates up and down in simple harmonic motion with a period of 2.3 s. The difference between the maximum and minimum sound frequencies detected by the microphone is 2.2 Hz. Ignoring any ...
January 29, 2012 by Claire

English Expression
How do you pronounce the l sound? Do you know how to say the l sound? Put the front part of your tongue on the gum in your mouth, and let the air pass on both sides of your tongue, saying l. What about the r sound? Can you speak the r sound? What is the difference between the ...
April 28, 2008 by John

Physics
A tuning fork creates sound wave with frequency of 170 hertz. If the speed of sound is 340 m/s, what is the wave length of the sound wave?
January 19, 2014 by Christopher

Physics
A tuning fork creates sound wave with frequency of 170 hertz. If the speed of sound is 340 m/s, what is the wave length of the sound wave?
January 19, 2014 by Christopher

Physics
a) A microphone has an area of 5cm^2. It recieves during a 4.0 s time period a sound energy of 2.0*10^-11 J. What is the intensity of the sound? b) using intensity from a) what is the variation in pressure in the sound wave, delta P ? Use T=293 K and density of air=1.2kg/m^3
February 21, 2010 by Dean

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

Intermediate algebra
Hello, I am kind stuck on this question In the lab you discover a relationship between the temperature of the air and the speed of sound. You find the speed of sound is never lower than 331 m/s and increases by 60% of the current temperature. a. What is the equation from this ...
November 28, 2011 by Jennifer

physics
1)As a sound source moves away from a stationary observer, the number of waves will. decrease 2)How fast should a car move toward you for the car's horn to sound 2.88% higher in frequency than when the car is stationary? The speed of sound is 343 m/s. fs(v-vd/v-vs) 343(1/1-987...
April 6, 2008 by Jon

physics
Why is an echo weaker than the original sound? 1. The echo has a shorter wavelength than the original sound due to the reflection. 2. The echo has a smaller amplitude than the original sound because sound spreads and its intensity decreases with distance. 3. The echo has...
March 21, 2013 by hannah

physics
1.calculate th speed of waves in water that are 0.4m apart and have a frequency of 2hz? 2. sound waves travel at approximately 340m/s what is the wavelength of a sound with a frequency of 20Hz? what is the wavelength of a sound with a frequency of 20 kHz? 3.a bat flying in a ...
March 31, 2011 by charlie

physics
the distance between a loudspeaker and the left ear of a listener is 2.70 m a) calculate the time required for sound to travel this distance if the air temperature is 20oC. b) assuming that the sound frequency is 523 Hz, how many wavelengths of sound are contained in this ...
November 18, 2012 by Joe

Physics
This question has me very lost. Two loudspeakers emit sound waves along the x-axis. The sound has maximum intensity when the speakers are 11 cm apart. The sound intensity decreases as the distance between the speakers is increased, reaching zero at a separation of 50 cm. What ...
November 29, 2008 by Phil

physics.
A sound wave produced by a clock chime is heard 571-m away 1.1-sec later. If the clock's sound is 434-Hz, what is the sound wave's wavelength?
February 28, 2013 by Quincy

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

english
16.A velar consonant is produced when … a the tip of the tongue touches behind the alveolar ridge. b the tip and blade of the tongue touches the hard palate. c the back of the tongue touches the hard palate. d the back of the tongue touches the soft palate or velum. 17....
August 20, 2010 by Jess

sound waves
What a vibrating object dose to the air particles around it? It makes them move...creating pressure waves that propagte thru the air, which we detect as sound if it is in the "sound" frequency wave
June 16, 2005 by sue

PHYSICS
A concert loudspeaker suspended high off the ground emits 35 W of sound power. A small microphone with a 1.0 cm2 area is 50 m from the speaker. (a) What is the sound intensity at the position of the microphone? (b) How much sound energy impinges on the microphone each second?
February 25, 2010 by Tyler

Sound Barrier
Could someone tell me what sound barrier is and what it means to break the sound barrier (in really simple terms)?
March 9, 2009 by Lena

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 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

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

physics
Suppose you are stopped for a traffic light, and a fast ambulance approaches you from behind with a speed of 34.0 m/s. The siren on the ambulance produces sound with a frequency of 960 Hz. The speed of sound in air is 343 m/s. What is the wavelength of the sound reaching your ...
July 29, 2013 by eddy

Helpp!!! physic...
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 13, 2013 by khadijah

Science--HELP!!
1. In which of the following situations is a sound wave most likely to travel through air? A) An alarm clock rings in a vacuum. B) A giant star explodes. C) A grasshopper eats a leaf. D) An astronaut uses tools in space. 2. Which of the following factors determines the ...
December 9, 2013 by Jasmine

Physics
Imagine you are in an open field where two loudspeakers are set up and connected to the same amplifier so that they emit sound waves in phase at 688 Hz. Take the speed of sound in air to be 344 m/s. If you are 3.00 m from speaker A directly to your right and 3.50 m from ...
June 4, 2012 by Mike

Someone please help me with science?
1. Which of the following shows the correct sequence of energy transformations when listening to the radio? electrical; kinetic; sound; kinetic; electrical electrical; sound; kinetic; sound; electrical sound; electrical; kinetic; electrical; sound kinetic; sound; electrical; ...
April 16, 2013 by Rebekah

7TH GRADE SCIENCE?!?!
1. Which of the following shows the correct sequence of energy transformations when listening to the radio? electrical; kinetic; sound; kinetic; electrical electrical; sound; kinetic; sound; electrical sound; electrical; kinetic; electrical; sound kinetic; sound; electrical; ...
April 16, 2013 by Rebekah

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
sound waves travel faster in humidity than in dry air. But as temperature increases the velocity of sound also increases. So sound travels faaster in hot day than in winter. But during winter there is also presence of humidity in fog. Why doesn't sound travel faster in winter?
February 3, 2013 by edward

Poetry question
Poems that use onomatopoeia arouse the sense of: sound, touch, smell or sight? Doesn't poems that use onomatopoeia ariuse the sense of sound? I think that it is sound. It is a word that is used to create a sound effect. for example sizzle, snap sorry- I mispelled the word ...
February 6, 2007 by Bailey

SCIENCE
The intensity level of sound A is 5.0dB greater than that of sound B and 3.0dB less than that of C. Determine the ratio(Ic/Ib) of the intensity of sound C to that of B.
October 28, 2013 by KING

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 PLEASE HELP
A source emits sound uniformly in all directions. There are no reflections of the sound. At a distance r1 from the source the sound is 6.5 dB louder than it is at a distance r2 from the source. What is the ratio r1/r2?
November 15, 2012 by Anonymous

English
Do you know how to pronounce the f sound. The f sound is a a labiodental. You should put your lower lip and upper teeth together. Then make air pass between them, saying f. The p sound is a labiodental. You should put your lips together and make the air pass through your lips...
June 9, 2008 by John

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
The siren of a police car produces a sound of frequency 420Hz.A man sitting next to the road notices that the pitch of the sound changes as the car moves towards and then away from him.1- WRITE DOWN THE NAME OF THE PHENOMENON. 2-ASSUME THAT THE SPEED OF THE SOUND IN AIR IS ...
October 12, 2010 by Lydia

Physics
Suppose you are stopped for a traffic light, and an ambulance approaches you from behind with a speed of 19.0 m/s. The siren on the ambulance produces sound with a frequency of 960 Hz as measured when you are at rest relative to the ambulance. The speed of sound in air is 343 ...
March 1, 2013 by Tessa

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
A train at rest emits a sound at a frequency of 1089 Hz. An observer in a car travels away from the sound source at a speed of 30.7 m/s. What is the frequency heard by the observer? Assume the speed of sound in air to be 343 m/s.
February 10, 2013 by Anonymous

Math
On th decibel scale, the loudness of a sound, in decibels, is given by D=10log(I/I0), where I is the intensity of a sound barely audible to the human ear. If the intensity of a sound is 10^11I0, what is the loudness in decibels? (please note the I0 is supossed to be I lower 0.
April 18, 2010 by Help!!

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

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