Wednesday
June 19, 2013

# Search: Does this sound ok?

Number of results: 3,851

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
Thursday, July 23, 2009 at 3:34am by anita

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
Thursday, April 17, 2008 at 8:28pm by Chris Adison

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.
Thursday, June 21, 2012 at 6:47pm by Hannah

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.
Thursday, March 1, 2007 at 5:33pm by Courtney

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...
Thursday, March 6, 2008 at 3:29pm by John

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 ...
Thursday, September 21, 2006 at 12:23am by Kat

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 ...
Sunday, June 12, 2011 at 8:45pm by nancy

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?
Monday, March 1, 2010 at 9:03pm by Ana

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 ...
Friday, May 6, 2011 at 2:44pm by Don't wanna get caught!

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 ...
Monday, April 4, 2011 at 7:13pm by math challenged

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.
Wednesday, March 28, 2012 at 11:36pm by Anonymous

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 ...
Sunday, March 3, 2013 at 2:23pm by Tim

Physics
The sound reaches you at the speed of sound after the plane passes overhead. You will not hear the plane until it has gone much further since it is going faster than a sound wave but it still takes the sound 20,000 meters/speed of sound to reach you from overhead. The triangle...
Sunday, January 31, 2010 at 6:58pm by Damon

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...
Monday, November 22, 2010 at 12:32pm 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 ...
Monday, November 22, 2010 at 11:23am 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 ...
Monday, November 22, 2010 at 4:27am by Bala

English Grammar
Not really. The "a" sound in Jane is what is called a long vowel sound. It says the sound of the name of the vowel. "a" In using diacritical marks, a straight line would be placed over the vowel. The word "glad" does not have the long "a"...
Wednesday, March 12, 2008 at 5:07pm by GuruBlue

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?
Monday, November 22, 2010 at 3:33pm by Jill

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?
Sunday, November 21, 2010 at 8:26pm 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?
Sunday, November 21, 2010 at 7:50pm by Mike

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? ...
Thursday, January 14, 2010 at 3:49pm by guli

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) ?
Wednesday, June 20, 2012 at 5:50pm by Hannah

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 ...
Saturday, November 24, 2012 at 11:51am by sarah

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...
Monday, March 28, 2011 at 11:02pm by Arlynn

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.
Tuesday, February 6, 2007 at 6:24pm by lost and confused

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?
Tuesday, May 31, 2011 at 8:37pm by LinWa

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 ...
Sunday, April 29, 2012 at 10:40am by chelsea

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?
Tuesday, December 2, 2008 at 11:17pm 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?
Tuesday, December 2, 2008 at 11:26am 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 ...
Tuesday, December 2, 2008 at 12:41am by Anonymous

English
Hi Mr. John, I am not a language expert, but would like to comment on your query. I feel 3 and 4 are incorrect. Or at least they sound so. To me, 2-2 and 5 sound gramatically perfect, while 1 and 2 sound ok, but too casual. Hope this helps
Tuesday, March 10, 2009 at 3:24am by Bijoy

Literature
What what kind of sound does the wind make. What kind of sound does the cat make when eating... Think in terms of words that sound like sounds: example-if you are eating peanut brittle... there is a crack and a crunch....When you say those words, they sound like the sound of ...
Tuesday, November 24, 2009 at 1:21pm by GuruBlue

Physics
The rumble is a sound, and sound travels at a speed of 343 m/s in air. The answer that was given is more than twice the speed of sound. Since we already know the speed of sound, we can only calculate the time required to travel 10km. VT = 10,000 m 343T = 10,000
Tuesday, May 22, 2012 at 12:50am by Henry

Physics => speed of sound variation
When flying at 9000 m, the sound speed at altitude is 331.5 - 0.607*(30-9000/150) = 331.5 - 18.2 = 331.5 m/s. On the ground the sound speed is 331.5+.607*30 = 349.7 m/s. The average speed of sound for a sound wave from plane to ground, when Tground - 30 C, is (331.5 + 349.7)/2...
Wednesday, February 20, 2008 at 10:12am by drwls

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)/(...
Saturday, April 21, 2007 at 12:54am by COFFEE

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 ...
Friday, November 30, 2012 at 10:17pm by joane

Physics SOUND
What is the resultant sound level when an 80-dB and an 85-dB sound are heard simultaneously?
Saturday, May 3, 2008 at 1:48am by Anonymous

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.
Sunday, April 29, 2012 at 2:27pm by Kristie

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 ...
Wednesday, November 14, 2012 at 10:31pm by Mike

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 ...
Tuesday, November 13, 2012 at 3:33pm by Michael

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 ...
Monday, November 12, 2012 at 8:52pm by Michael

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
Sunday, February 22, 2009 at 9:37am by fern

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 ...
Monday, November 12, 2012 at 7:29pm by Kevin

phsyics
The reflected sound has a higher frequency, so the insect is approaching. (delta f)/f = 0.4/40 = 0.01 = 2 V/a The number 2 accounts for Doppler shift incident and reflected sound a is the sound speed. Assume a = 340 m/s V = 1.7 m/s
Thursday, July 19, 2012 at 9:39pm by drwls

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
Monday, January 21, 2013 at 2:05pm 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.
Tuesday, January 15, 2013 at 11:38am by Orla

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...
Monday, November 12, 2012 at 4:42pm by Michael

physics
Why is an echo weaker than the original sound? 1. The echo has a shorter wavelength than the original sound due to the re&#64258;ection. 2. The echo has a smaller amplitude than the original sound because sound spreads and its intensity decreases with distance. 3. The echo...
Thursday, March 21, 2013 at 9:43pm by hannah

Science
mach=speed sound what is the speed of sound at 1C? vsound=If I remember correctly 331(1+.6TempinC) check that formula. get the speed of sound, multiply it by 2.5
Wednesday, April 3, 2013 at 10:42pm by bobpursley

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 ...
Monday, April 28, 2008 at 11:05am by John

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
Friday, April 18, 2008 at 1:44pm by Chris Adison

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?
Saturday, January 15, 2011 at 1:46pm by Anonymous

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
Friday, October 1, 2010 at 6:14am by lorraine

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
Saturday, April 19, 2008 at 9:32am by chris adison

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
Tuesday, December 13, 2011 at 12:37pm 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 ...
Monday, November 28, 2011 at 9:55pm by Jennifer

Sound Barrier
Could someone tell me what sound barrier is and what it means to break the sound barrier (in really simple terms)?
Monday, March 9, 2009 at 9:54pm by Lena

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?
Tuesday, October 21, 2008 at 10:11pm by Valerie

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?
Thursday, February 28, 2013 at 9:06am by Quincy

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 ...
Thursday, March 31, 2011 at 4:34pm by charlie

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 ?
Thursday, October 25, 2012 at 3:39pm by Kristen

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
Sunday, February 21, 2010 at 8:45pm by Dean

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 ...
Wednesday, November 5, 2008 at 10:20pm by Sally

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?
Thursday, February 28, 2013 at 12:05am by Kelvin

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
Thursday, June 16, 2005 at 12:07pm by sue

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....
Friday, August 20, 2010 at 4:54am by Jess

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...
Sunday, April 6, 2008 at 5:34pm by Jon

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 ...
Sunday, November 18, 2012 at 7:40pm by Joe

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 ...
Tuesday, April 5, 2011 at 4:31pm by janine ricca

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 ...
Sunday, January 29, 2012 at 12:59pm by Claire

Spanish
That is -zar and -cer. It has to do with the sound system. In Spain, with Castillian, both the infinitives would sound like "th" = "thar" and "ther." Here are all the "sounds" to worry about! z&gt;a or z&gt;o or z&gt;u = c&...
Tuesday, September 7, 2010 at 8:35pm by SraJMcGin

Sound Barrier
In the years before 1950, it was very difficult for airplanes to fly faster than the speed of sound because of shock waves that form in front of the wings and propellers that greatly increased the aerodynamic drag. Control of the airplane was also difficult because of ...
Monday, March 9, 2009 at 9:54pm by drwls

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?
Thursday, February 25, 2010 at 9:21pm by Tyler

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; ...
Tuesday, April 16, 2013 at 11:41pm by Rebekah

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; ...
Tuesday, April 16, 2013 at 10:52pm by Rebekah

Physics Gr11 Sound Waves
No, sound speed is independent of frequency. It just IS. It depends only upon the temperature (not even the pressure) of the air it is going through. As for "why?", that requires a physical derivation, with thermodynamics considered. An adiabatic heating and ...
Thursday, October 29, 2009 at 10:49pm by drwls

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?
Sunday, January 13, 2013 at 3:32pm by not sure

Physics-Sound Waves
The answer as I see it... The difference of the two speaker volumns plus the decay of the transverse wave passing to the audience, that is without the exterraneous sound waves fooling the ears. Sound is movement of air. In a vacuum, there is no sound. Air is like water. When 2...
Wednesday, April 4, 2007 at 10:53pm by Peter

computers
Sometimes I have turned my sound off and have forgotten. Have you made sure the sound is turned on? You can tell by bringing up the sound controls and making sure the little box next to Mute is unchecked. The only other thing I can think of is the computer's sound card. If...
Tuesday, January 20, 2009 at 3:43am by Writeacher

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 ...
Sunday, February 3, 2013 at 12:24pm by edward

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...
Sunday, April 6, 2008 at 8:44pm by Jon

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 ...
Saturday, November 29, 2008 at 2:34pm by Phil

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 ...
Tuesday, February 6, 2007 at 3:39pm by Bailey

The long "i" sound is the same sound as when you say that letter in the alphabet. It rhymes with "eye." Which of those words has an "i" that rhymes with "eye"? The letter combination "in" includes a short "i" sound. ...
Monday, March 29, 2010 at 7:58pm by Writeacher

ultrasonic dog?
The speed of sound in air varies with temperature. It is 331 m/s at 0 C and 343 m/s at 20 C. The whistle frequency would be 37,000 Hz. I doubt if the dog emits the sound, as your question implies. It is the dog whistle that makes the sound.
Monday, January 7, 2013 at 10:03am by drwls

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...
Monday, June 9, 2008 at 3:23am by John

physics
a source of sound id traveling towards a stationary observer .The frequency of sound is heard by the observer is 25% more that the actual frequency.If the speed of sound is v,that of the source is options: 1.v/4 2.v/5
Sunday, June 17, 2012 at 5:22am by ashu

Algebra II
1. A sound has an intensity of 5.92 „e 1025W/m2.What is the loudness of the sound in decibels? Use . 2. Suppose you decrease the intensity of a sound by 45%. By how many decibels would the loudness be decreased?
Wednesday, January 25, 2012 at 9:57pm by Nick

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 ...
Tuesday, October 12, 2010 at 5:44pm by Lydia

science
Ear defenders work by absorbing the sound that was headed to your ear. They absorb the sound waves by increasing air resistance this reduces the loudness of the waves. The energy is converted into heat and the person wearing them can hear sounds at quieter amplitude than the ...
Thursday, July 8, 2010 at 9:13am by madz

science
Ear defenders work by absorbing the sound that was headed to your ear. They absorb the sound waves by increasing air resistance this reduces the loudness of the waves. The energy is converted into heat and the person wearing them can hear sounds at quieter amplitude than the ...
Thursday, July 8, 2010 at 9:13am by madz

physics
Light travels about one million times faster than sound (in air), so you may consider the sight of the dropping of the ball to be the same instant that it really happens. Divide the separation distance (150 m) by the time delay of the sound (0.45 s) to get the speed of sound. ...
Tuesday, August 9, 2011 at 11:00am by drwls

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.
Sunday, February 10, 2013 at 3:55pm by Anonymous

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 ...
Monday, June 4, 2012 at 4:30pm by Mike

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 ...
Tuesday, May 31, 2011 at 5:13pm by marinana

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 ...
Thursday, May 8, 2008 at 8:01am by Katie

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 ...
Friday, March 1, 2013 at 7:06pm by Tessa

Physics
You want to know the car's velocity when it emits a sound frequency that is HEARD as 0.95*524 = 497.8 Hz You will need to assume a sound velocity a, and that requires assuming an air temperature. The received frequency is 497.8 Hz when 497.8 = 524[a/(a-V)] (That is the ...
Monday, February 22, 2010 at 5:53pm by drwls

Science
Can sound exist in a vacuum? No Yes...my hoover is loud when I turn it on! Ignore Eddie's remark. His Hoover is not in a vacuum. It only creates a partial volume inside itself. Since sound is produced by the movement of molecules, and there are no molecules in outer space...
Wednesday, May 16, 2007 at 7:04pm by Michael