Sound waves Definition and 316 Threads

Homework Statement Ships measure the distance to the ocean bottom with sonar. A pulse of sound waves is aimed at the ocean bottom, then sensitive microphones listen for the echo. The graph shows the delay time as a function of the ship's position as it crosses 60 km of ocean. Draw a...

1.) A transverse wave is traveling with a speed of 300m/s on a horizontal string. If the tension in the string is increased by a factor of four, what is the speed of the wave? 2.) A wire has a cross-sectional area of 4.2 X 10-8 m2 and is made from a material whose density is 7900 kg/m3...

Are sound waves released in quanta? If so, what are these bosons called? If I'm wrong, please explain why?

Is this real? http://www.metacafe.com/watch/416486/salt_sound_waves/ What's happening?

Homework Statement People put their ears to a railroad track to get an early warning of an approaching train. why did this work. Homework Equations written response. The Attempt at a Solution Sound waves can travel a long way along an undisturbed metal rod?

Greetings! Once again I don't know where to classify this tread... sorry. My Question is the following: Let's say we have a ball of mass, m. Let the mass be a steal ball for example. We throw the ball at the floor. The impact that follows surely is a non-conservative impact. (I hope I said...

Hi, I have been staring at this problem for 2 hours now, and I feel like it is really simple, but I cannot quite wrap my head around it...here it is A violinist places her finger so that the vibrating section of her 1.0 g/m string has a length of 30 cm, then she draws her bow across it. A...

Homework Statement When you drop a rock into a well, you hear the splash 1.5 sec later. How deep is the well? Homework Equations The Attempt at a Solution Speed of sound 343m/s x=(343m/s)(1.5)=514.5

Homework Statement In a science fiction movie, when a spaceship explodes, the vibrations from the sound nearly destroy a nearby spaceship. If you were the science consultant for the movie, what would your advice be for the producer? Homework Equations I don't think there are any...

Homework Statement Explain why different instruments produce sounds of different quality. Homework Equations None. The Attempt at a Solution Different instruments produce sounds of different quality as they produce sound waves with different waveforms. -----------------------...

Homework Statement Compare sound waves to waves in coaxial cables a.k.a. T.E.M. I really have no idea how to answer this question. I've been researching and researching, and so far i can't find any information about WAVES for coaxial cables. Any help? Thanks. Homework Equations...

hey i need to know how to find the temperature of a room using the speed of the sound waves. if two rocks are hit together and then each strike is in time with the echo (rocks are 100m away from wall), and the time to make 150 strikes is 92 seconds, what is the air temperature? thanks

Homework Statement Here's the link for the questions: http://i13.photobucket.com/albums/a283/nadinevictor/PHYSICShw.jpg There are quite a many. Homework Equations Speed of wave propagation= wavelength/period The Attempt at a Solution

Homework Statement Link to problem: http://img147.imageshack.us/my.php?image=soundqj3.png Homework Equations No idea, One of the reasons I'm asking. >.> The Attempt at a Solution Ok, I have no idea how to even begin this problem. I need a hint in the right direction, or just what...

Homework Statement Diffraction occurs for all types of waves, including sound waves. High-frequency sound from a distant source with wavelength 9.20 cm passes through a narrow slit 11.5 cm wide. A microphone is placed 35.0 cm directly in front of the center of the slit. The microphone is then...

Homework Statement 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. What is the shortest distance d you need to walk forward to be at a point...

Homework Statement Earthquakes are essentially sound waves traveling through the earth. They are called seismic waves. Because the Earth is solid, it can support both longitudinal and transverse seismic waves. These travel at different speeds. The speed of longitudinal waves, called P waves...

A firework charge is detonated many meters above the ground. At a distance of 400 m from the explosion, the acoustic pressure reaches a maximum of 10.0 N/m2. Assume that the speed of sound is constant at 343 m/s throughout the atmosphere over the region considered, that the ground absorbs all...

Homework Statement Two speakers are driven by the same oscillator whose frequency is 140 Hz. They are located on a vertical pole a distance of 4.45 m apart from each other. A man walks straight toward the lower speaker in a direction perpendicular to the pole. (a) How many times will he hear...

Apparently, by what I read, the pressure intervals are 90 degrees out of phase with the displacement intervals for a sound wave. How is that so? When the medium is compressed, shouldn't the pressure be at a maximum and when at rarefactions, shouldn't the pressure be at a minimum?

Homework Statement see topic title Homework Equations I think that sound waves are vibrations of particles in a medium. The vibrations continue until the energy is gone. Sound seems to need a medium to travel through. Light can travel in a vacuum. your eye sees it from a source...

do sound waves carry momentum? any momentum at all (no matter how small)? the obvious answer is that they carry energy but not momentum but i am wondering whether they don't theoretically carry some very tiny (usually negligible) amount of momentum in the same way that light, even though it...

Homework Statement A tuning fork vibrating at 512 hertz falls from rest and accelerates at 9.81 m/s^2. How far below the point of release is the tuning fork when waves of frequency 485 Hz reach the release point? take the speed of sound in air to be 340 m/s. (don't forget it takes the sound...

Hello to all, I've been wondering about sound waves for a while, and here's one question that came up... Is there a natural limit to sounds being in the audible range... I mean, if we amplify the sounds (edit: the air pressure differences , since I'm not sure they would fall in the sound...

When sound waves of the same frequency interact, they amplify. Sound waves of different frequencies cancel each other out. Where does the energy go when they cancel?

The problem: Two speakers emit a sound with a frequency of 550.0Hz. At what distance should they be placed to maximize destructive interference? I have the steps in solving this problem written on my worksheet, and it says that the speakers should be placed at 1/2 wavelength. The thing I...

[SOLVED] Standing Sound Waves What are the three longest wavelengths for standing sound waves in a 121 cm long tube that is (a) open at both ends and (b) open at one end, closed at the other? the wavelength equation that i used for open-open was \lambda= 2L/m; where m is the number of...

Ok this problem seems blatantly easy but for some reason I just cannot find the equation. Homework Statement The middle C string of a piano is supposed to vibrate at 261.6 Hz when excited in its fundamental mode. A piano tuner finds that in a piano that has a tension of 900N on this...

[SOLVED] Sound waves and vibrations I read a post here on PF dated back in Nov 2003. 'Security' needed some help with his Physics exam... and what a coincidence! I'm also working on that same exam now. PF Admin 'chroot' helped him with the questions... and I got confused with some of his...

"If two flutists play ther instuments together at the same intensity, is the sound twice as loud as that of either flutist playing alone at the intensity? Why or why not?" I know that the answer has something to do with the sensation of loudness being logarithmic in the human ear, but I...

Homework Statement The intensity at a distance of 6.0m from a source that is radiating equally in all directions is 6.0x10^-10 W/m^2. What is the power emitted by the source? They give you multiple choice answers, and the answer is 2.7x10-7 W. Homework Equations I is...

[SOLVED] Sound waves in solids? Hello! As far as i have learned sound waves are longitudinal! They propagate in gases liquids and plasmas. Does sound waves propagate through solids too? If so, what type of waves? Longitudinal or transversal? Thanks Note:If you consider this homework, sorry...

Homework Statement (a) Standing sound waves are produced in a pipe that is 2.00 m long and open at both ends. (Give all answers measured from the left end of the pipe, and from smallest to largest where there is more than one answer.) (i) For the fundamental and first two overtones...

Homework Statement The speed of sound along the ground is about 6.75 km/s while the speed of sound in air is 342 m/s. A very powerful explosion occurs some distance away and you feel the ground vibrate 74.0 seconds before you hear the sound of the explosion. How far away is the explosion...

The topic came up the other day in class, about how the wave frequencies vary in each pipe of an organ. I am looking for some comprehensive information on the topic, and it would be great if someone could direct me, or maybe help a little bit as I am not so sure, as we haven't covered the topic...

If you fill a glass with water and hit it on the side with a knife then you get a higher pitch the more you fill it up. Why is this? When you hit the glass you aren't really making the air in the glass vibrate as you do when you blow over the top of a bottle, you're just making the glass...

Why do scientists use sound waves on water? And also can you provide some examples of applications of sound waves on water, for ex. submarines.

My question is regarding musical instruments. Their are waves produced in wind instruments and in stringed instruments. If a wind instrument (lets say a tuba) is played directly next to a stringed instrument (lets say a guitar) will the sounds waves (in air) produced by the wind instrument...

[SOLVED] Comparison of sound waves in air and underwater Homework Statement In air, the human ear is most sensitive to sound waves of 3300Hz. The auditory canal is part of the human ear. It is a tube of length 0.025m, i.e. 1/4 the wavelength of sound with frequency 3300Hz. When under...

Homework Statement A pair of speakers separatd by .700m are driven by the same oscillator at a frequency of 690Hz. An observer originally positioned at one of the speakers begins to walk along a line perpindicular to the line joining the speakers. How far mus the observer walk before...

i saw the 'proof' of the wave equation for a sound wave in a medium assuming the wave equation for a dissplacement wave. that is the equtaion s=s_{0} \sin(kx-wt) is supposed to hold for all points for a wave propagating in the x direction. then using this he found out the excess pressure at...

[SOLVED] Interference of Sound Waves Two loudspeakers, A and B, are driven by the same amplifier and emit sinusoidal waves in phase. The frequency of the waves emitted by each speaker is 172 Hz. You are 8.00 m from speaker A. Take the speed of sound in air to be 344 m/s. What is the closest...

[SOLVED] Interference of Sound Waves Two loudspeakers, A and B, are driven by the same amplifier and emit sinusoidal waves in phase. The frequency of the waves emitted by each speaker is 172 Hz. You are 8.00 m from speaker A. Take the speed of sound in air to be 344 m/s. What is the closest you...

Two loudspeakers are placed side by side a distance d apart. A listener observes constructive interference while standing in front of the loudspeakers, equidistant from both of them. The distance from the listener to the point half-way between the speakers is l. One of the loudspeakers is...

Solved it. Thanks anyway.

I want you to help me in resolving these questions First question When Down stone in the basin of water eroded the bandwidth with dimension The Center fell in stone. What explanation The second question Sound waves move from air to water. Discussed the impact on The frequency and...

Imagine a 1-molecule thick layer of liquid, evenly dispersed across a perfectly flat surface. This surface is (for this thought experiment) impenetrable and sound does not pass through it; it is unable to resonate or vibrate. If we apply sound waves or some other frequency/wave generation to...

Why can a sound wave with a high frequency travel further and stay more concentrated (i guess there are basically the same) than one with a lower frequency? Thanks.

Homework Statement I just used the Kundt's tube to illustrate the effect of a standing sound wave in a glas tube. The characteristic nodes and antinodes were perfectly visible and some small scale striated vibration patterns at the antinodes were prominent. What is the physical explanation for...

(a) First, consider a string of length 1m attached at both ends. It sounding a fundamental tone of 440 Hz. What is the wavelength of the above waves on the string? What is the speed of the waves on the string? (b) Now consider a Boomwhacker™ tube open at both ends, sounding a tone of 440...