Sound waves Definition and 316 Threads

[SOLVED] Amplitude of Sound Waves from Two Sources at a Point Problem. Two sources, A and B, emit sound waves, in phase, each of wavelength \lambda and amplitude D_M. Consider a point P that is a distance r_A from A and r_B from B. Show that if r_A and r_B are nearly equal (r_A - r_B \ll r_A)...

why will ultrasonic waves not interfere with other sound waves in water?

I was wondering what property in sound stays the same when the sound wave's speed, pitch, and/or tempo are changed. I would like to know this to create a time coded signal on vinyl record for a vinyl emulation software.

Does sound waves interact with each other and cancel each other out. I'm not talking about constructive or deconstructive interference either. If a strong sound source is pointed towards a weak one does the compression of air interact with other waves. I don't know if I asked it right or if...

Homework Statement 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 343, 1482, and 5040 m/s, respectively. The sound...

you know the high pitched buzzing you can sometimes hear from electric wires, or from the capacitor on a camera charging (for the flash)? i was wondering what creates that noise. my best guess is that it is caused by the vibrations from the electrons bumping into each other, but it seems like...

Who was the first person to measure sound waves and how did he do it. Also how can you measure sound waves with a tuning fork.

Our discussion group, American Windfarms was contacted by students in NJ, who are working on and internet technology challenge...to learn whether they can convert sound wave generation into power generation. Any ideas??

A strange question that I recently thought of. Both sound and light are waves so why is it that I can hear through walls and around corners but can't "see" through walls and around corners?

The intensity of the sound wave from a jet airplane is 9.00 W/m2 at a distance of 4.8 m. At what rate does the jet airplane radiate energy in the form of sound waves? Assume that the sound wave radiates from the airplane equally in all directions. I am having trouble starting this problem...

Homework Statement A guitar string that is 85cm long is plucked. The fundamental frequency of the string is 350Hz. The string's tension is then increased and its wave speed is 1000m/s The string is vibrating at its fundamental frequency and a closed tube is next to it. A loud sound is produced...

When an earthquake occurs, two types of sound waves are generated and travel through the earth. The primary, or P, wave has a speed of about 8.0 km/s and the secondary, or S, wave has a speed of about 4.5 km/s. A seismograph, located some distance away, records the arrival of the P wave and...

The problem is this: A firework charge is detonated many meters above the ground. At a distance of 400m 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...

What are the effects of weightlessness on sound waves, if any? [Not talking about human hearing or ability to locate sound]

Hi, I need to determine the sum of the two sound waves and express it in the form y=Csin(kx-wt-"theta") where w is omega. The two waves are y=Asin(kx-wt) where w is omega y=Bsin(kx-wt-"phi") where w is omega I used a trigometric formula and got it to the point where it equals...

my theory may be sloppy and wrong - but here it goes when people start talking about speakers and their enclosures there are generally two types used, ported and sealed. sealed being just that, and airtight box with a speaker in it. but a ported box is far from air tight instead they put a...

I am having trouble with these two problems.. 1.By how many decibels do you reduce the sound intensity level due to a source of sound if you quadruple your distance from it? Assume that the waves expand spherically. For this one do I have to find ratios of I1/I2 and then substitute it in...

It's a tech.,and it is said that that had been done by MIT,then anybody know the details?

I am clueless on how to approach the following problem, and was wondering if anyone would be able to help me. Thanks!

i really had troubles with solving this problem and it would be greatly appreciated if i can get a full solution, thank you A vibrating 400.0 Hz tuning fork is placed in fresh water. What is the frequency in hertz and the wavelength in metres. a) within the water at 25 C b) when the...

A 50 dB sound wave strikes an eardrum whose area is 4.1 * 10-5 m2. (a) How much energy is absorbed by the eardrum per second? W (b) At this rate, how long would it take your eardrum to receive a total energy of 1.0 J? years I have tried to solve using I=2pi^2f^2A^2pv and got f=280 ...

Sound Waves Problem and I'm Stuck! Please Help! Linear Superposition The sound produced by a loudspeaker has a frequency of 12,000 Hz and arrives at the microphone via two different paths. The sound travels through the left tube LXM, which has a fixed length. Simultaneously, the sound...

Sound waves and frequency In my opinion, the answer is that frequency affects directly to the velocity of the sound. Therefore, high frequency sound have high velocity. Can someone post if this is right or not? If not, can anyone provide the correct answer? Thanks in advance.

I have a couple homework questions that I am having trouble with...any help would be appreciated ASAP! 1.)A tuning fork generates sound waves with a frequency of 238 Hz. The waves travel in opposite directions along a hallway, are reflected by walls, and return. The hallway is 45.0 m in...

A jackhammer, operated continuously at a construction site, behaves as a point source of spherical sound waves. A construction supervisor stands 63.5 m due north of this sound source and begins to walk due west. How far does she have to walk in order for the amplitude of the wave function to...

My physics professor attempted to teach two chapters of new material within two class periods, but unfortunately this is not enough time to cover the material as in depth as we will be tested on. Exam is this mon and I am very confused about the things he did not explain - I feel like he left...

For some reason I have trouble with questions like this. How would I get the phase difference if I were given the time delay of two loudspeakers side by side? I'll use this question as an example: "The speakers are now placed side by side. If the wire to speaker 1 is passed through a...

7. A block with a speaker bolted to it is connected to a spring having spring constant k = 20.0 N/m as in Figure 3. The total mass of the block and speaker is 5.00 kg, and the amplitude of this unit’s motion is 0.500 m. If the speaker emits sound waves of frequency 440 Hz, determine the range in...

I posted this in general physics forum but in retrospect I think I should have posted it here. Since piston compresses and decompresses a gas, it must be generating sound waves. Lets take a small engine with piston stroke 86mm, RPM 8000. An 8000 RPM means it is making 133.333 revolutions...

I am wondering what density is required for a sound wave to travel at the speed of light (if possible at all!) I'm not sure if there is a critical density at which a sound wave can go no faster. Another related question is about 'cerenkov radiation': is it the same thing as light? That is...

Hi, I have a question involving beats and sound waves. When two sound waves (one with a MUCH LARGER Frequency than the other) combine, what would happen? Would there still be a beat pattern? Me, I think that if there still is a beat pattern, it would have the same frequency as that of the...

Hello I am interested in calculating the sound waves created by objects in air. What is the resolution of details that needs to be dealt with in orer to calculate this? Can it be calculated by using traits of the object such as mass density, geometry and other related attributes? Or do you...

Hi. I am looking for correct mathematical definition of longitudal wave I am 3-D if somebody will help me with some link or explanation it will be great. Another thing: when I have a point source of waves i see that wavenumber changes from one point to point, is it wright? thanx

Can someone help me with this question, I am stucked A and B are two observers 1km apart . There is a steady wind blowing . When a gun is fired at A the time interval between the flash and report observed at B is 3.04s. When a gun is fired at B the time interval between the flash and report...

Hi, Can someone please help me with the following problem: Standing at a crosswalk, you hear a frequency of 560 Hz from the siren of an approaching ambulance. After the ambulance passes, the observed frequency of the siren is 480 Hz. Determine the ambulance's speed from these observations.

This might be a silly question, but i just realized i don't really know why we don't hear the sound of explosions from the Sun. Well, we do know there is "almost" noting in outer space. But there still is not much resistance + matter for the oscillations to reach Earth.

sound waves and location? please help with my phantom! Hi, Here is my problem strange as it may be: I have an old piano which due to it's age and condition, when played, emits no musical notes or musical sound it is more of an attractive antique furniture piece than anything. However, of...

*please move if in wrong forum* Im taking the IB at a school in New York and every 11th grader has to do a project called Einstein on the Beach. It involves creating your own project and doing it on the beach that the school will travel to on a day trip. I am trying to come up with a good...

Here is a problem i do not know how to set up: Two speakers, driven by the same oscillator (f=200Hz). They are located on a vertical pole 4m from each other. A man walks straight toward the lower speaker, perpendicular to the pole. How many times will he hear a minimum in sound intensity and...

There is a diagram in my book for this problem... I'll try my best to describe it! There are two speakers (A & B) that form a right triangle (at B) with the listener (C). Suppose that the separation between speakers A and B is 5.00 m and the speakers are vibrating in phase. They are playing...

I'm confused by this problem: http://myspace.homelinux.com:32123/sound.jpg Can someone explain the solution and what's wrong with my reasoning? It takes 1.7/340 = .005 sec for the wave to travel the 1.7m. So for the waves to cancel woudn't .005 = T * 1/2 * n (where T is the period of the...

A bat flies toward a wall, emitting a steady sound of frequency 2.00 kHz. This bat hears its own sound plus the sound reflected by the wall. How fast should the bat fly in order to hear a beat frequency of 10.0 Hz? Give your answer to two significant figures. Take the speed of sound to be 344...

Hi everyone! I need help on these two problems: 1.) A flower pot is knocked off a balcony 20m above the sidewalk and falls toward an unsuspecting 1.75-m-tall man who is standing below. How close to the sidewalk can the flower pot fall before it is too late for a shouted warning from the...

Is it possible (or even practical) to create a device that can harness the power of sound waves?

Don't really understand the first part of the question. When 2 trumpets were sounded together, 6 beats were heard in 2s. If the frequency of one trumpet was 786Hz, what were the possible frequencies of the 2nd trumpet. I keep on gettin' 3+Hz but don't know if it's right.

A saling ship is traveling in the North Atlantic at night. The captain is worried about ice bergs, but has no radar. The captain sounds the ship's horn and hears the echo 2.4s later. If the air temperature is -10degrees Celsius, how far away is the iceberg. I think I know how to do it but...

This is a simple question, but i can't seem to get my bearings right on it. Consider two speakers at essentially the same point emitting sound waves that are half a cycle out of phase but otherwise identical. Interference dictates that these two waves should cancel out. The resultant wave, now...

There's this problem I'm having lots of trouble with. It is: A person hums into the top of a well and finds that the standing waves are established at frequencies of 48, 80, and 112 Hz. The freq. of 48 Hz is not necessarily the fundamental freq. The speed of sound is 343m/s. How deep is the...

I have three questions about sound waves. I could have asked my physics teacher but he fails to answer almost all the question out of our syllabus. :mad: 1- We have read that the speed of sound in solids doesn't depend on their desities. If that's the case then they depend on what thing...

>> A driver travels northbound on a highway at a speed of 23.0 m/s. A police car, traveling southbound at a speed of 42.0 m/s approaches with its siren sounding at a frequency of 2260 Hz. (a) What frequency does the driver observe first as the police car approaches and then as it passes...