Sound Definition and 1000 Threads

I am not sure I understand the question. Based on "The ambulance travels towards, passes close to, and then travels away from a stationary observer", I would answer greater than f then less than f. If based on "as the ambulance passes the observer", I would say less than f and constant (option...

< no ranting here. All perfectly cromulent > I want WhatsApp to go back to respecting my system sound preferences. I keep my phone on mute 95% of the time, so I only get notifications (texts, phone calls) by vibrate. WhatsApp just ignores this and alerts me audibly anyway. I know there are...

My brother has terminal rectal cancer, and he has a colostomy bag. He feels humiliated in quiet waiting rooms with other people when his bag starts making fart sounds. I'm trying to find a material to enclose his colostomy bag to dampen the sounds. There's a company that sells neoprene foam...

HI, Just found this on google "Can sound travel through clay?" and signed up. 2019 my home was hit by an energy wave causing a humming inside, no noise outside just in. the humming is 24 / 7 and worse in the early hours, 1am through to 6am. I am the only household suffering, it is so...

I do not remember the correct terms to look this information up on Google. I once read that as a pressure wave goes down into a closed cone every time cross sectional smaller by 1/2 the pressure wave doubles. My cone is 12" x 12" on the open end and 1"x1" on the closed end. Cone is 24" long...

I have tried to draw the diagram and would just like feedback on it to know whether it is correct or not. Please keep in mind this was done roughly. Thanks

Hello All. I looked at a question "A noisy machine in a factory produces sound with a level of 80 dB. How many identical machines could you add to the factory without exceeding the 90-dB limit?" The solution in link below assumes the intensity will increase n fold if I add n machines. Why is it...

I have a leaf blower that states the sound level is 75dB. My question is, at what distance is this measured. It seems that as you get closer to the source, the dB number will increase drastically. If I double the distance from the source, then the power should go down by a factor of four or 6...

Hello, It has been difficult to find a clear answer to this question. I've found some sources stating that the power of a sound wave depends upon both amplitude and frequency. I've found other sources stating that the power of a sound only depends on amplitude. I've found sources stating...

Here is an applet for playing around with Fourier coefficients and sounds. Here is a document explaining a bit about the applet. I did not quite understand everything. Let me go through it. Sound as perceived by humans is the physical phenomenon of variations in air pressure near the ear...

[I do not know if this is the right subforum] The answer to the question to the title is: for very long time. However the tuning fork clearly has to stop at some point because some of the energy will turn into heat. However I want to quantify for how long. More specifically I am interested on...

So I have done an experiment on the amount of sound energy absorbed based on thickness of pvc foam, and found a logarithmic relationship between the two. I've used the frequency-dependent acoustic attenuation power law, which is derived from stokes' law. Frequency-dependent acoustic attenuation...

Here is the exercise: Which one seems logical and correct ? this one: [ Normally when we increase distances, the velocity of sound decreases?] Or this one? You might wonder why. Well, my friend in class told me that the second table could be correct because the experiment was conducted at...

Hello, I have a problem wrapping my head around the relationship between frequency, power/pressure, and displacement. Let's say I have two sine waves that I generated in my computer: A 50 Hz tone and a 100 Hz tone. Let's say they both have an amplitude of 1. Therefore, they will both have...

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Hi! This project involves both mechanical and electrical elements, so I'm discussing it in this forum since I'm not sure which one it would fit better into. I'm working on an experiment in which I'm trying to measure the speed of sound through water. The approach is simple: I have a long...

Hi, I am looking for some sound clip examples of the doppler effect for some specific questions. Specifically I would like to find a single tone/horn recorded in the three different ways: 1. Not moving at all 2. Moving past the recorder at a slower speed 3. Moving past the recorder at a higher...

The graph is, I do not understand why how it is possible to find the speed of sound from the gradient for this graph. Can someone please help? Many thanks!

When a coin is dropped from a certain height and collides with a glass surface, is the majority of the potential energy converted to sound or heat? And how would one determine this as I only hear the sound and cannot measure the significant change in temperature?

I brought time over to the other side and multiplied to get 686 m/s but that wasn't correct

It seems that a sound (eg aa, ah, ih...) has a variable range of sound.I know that the before is affected by the follow, eg ''d" in do and did are different. Are there any other rules for the variation range?

Hey all, For my physics major I need to quantify the acoustic effect of sunfields. I'm trying to do this by measuring the sound level before and after a sunfield, and after that by measuring a comparable situation, only without a sunfield. By comparing the results of the two measurements I'll...

If I have on my PC let's say sound on 50% and I increase it on 100%, how would the sound intensity change? Would it be twice bigger? But I think that function of sound intensity level dependent on sound percets is a linear function, isn't it? How to explain it? Why is it the linear function?

My answer is (1) and (2) but the teacher said it is only (1). I thought the speed of point at center of compression and center of rarefaction would be the maximum. Or the correct one is the speed at center of compression and center of rarefaction would be zero? Thanks

There is a massive and continuous fireball as fire crackers are exploding, generating thousands of shockwaves. Perhaps they are bouncing off each other and cancelling each other out like noise cancelling headphones,

How did you find PF?: By searching for a answer to my question and everyone only knows how helium effects the sound of their voice not mine.No one has a a answer to the question why doesn't helium have any effect on the sound of my voice? My question that no one has a answer to and ignores the...

I am designing an experiment for pam-ook which acquires a radio audio signal to the mic input of my laptop. I process the signal using c++ code employing an audio library (PortAudio) which provides the data stream. I require a sampling rate of 1.2msps but the sound card in my laptop has a...

Eu estava ouvindo The Beatles, a música "Yellow Submarine". Percebi que os instrumentos e os vocais saíam de fones de ouvido diferentes, os instrumentos do lado esquerdo e os vocais do lado direito. Gostaria de saber: Como isso acontece? E como é feita essa separação entre vozes e instrumentos...

When we talk about sound waves in a fluid (air, water e.t.c.) we mean that the pressure ##P(x,y,z,t)## satisfies the wave equation, the so called velocity field of the fluid ##v(x,y,z,t)## satisfies the wave equation or both?

Does high humidity air transfer sound better than dry air?

Does this sound too close to being a rip off of Halo. By the 23rd Century, a special component spread out over the Naval Defense Force, Ground Defense Forces, and United Space Force is SPARTAN or SPecial Assault opeRations TeAms Network. SPARTAN is broken up into 10 Units, the GDF has 5, the...

So I'm trying to understand the sound horizon measured at recombination and the sound horizon measured with BAO. Here is what I've gathered (PLEASE tell me if I'm wrong and if you could please explain, I've been trying to read but can't find a clear explanation): ~r(z*) is measured using CMB...

We have 2 open metal tubes, made of Stainless Steel. They both are the same length of 1 metre, and and Outer Diameter of 76mm. One pipe has a wall thickness of 1.5mm, and the other has a wall thickness of 2.0mm. It was our reasonable guess that the tube with 2.0mm wall thickness, should...

https://futurism.com/why-you-can-never-actually-touch-anything/amp We know the friction happens because of the intermolecular forces between the atoms of the surfaces in contact. When we place something on other there are places where they get come in contact there are bonding formed and due to...

I live near some highways that are roughly "a couple of miles" away. On some blessed days they are inaudible, and on other days they roar with a low frequency sound that penetrates into every corner of the basement. (If frequency matters, it would be most preferable to refract sound at 20Hz...

Using the equations mentioned under this question, I came up with following analysis and directions of velocities on either side of ##x_1##. Also, I'm not sure if there is an easier qualitative way to know the velocity directions rather than do a detailed Calculus based analysis?

I know that standing waves form in an open organ pipe. Since, standing waves can only form from superposition of original wave and reflected wave, so there must be a reflected wave in an open organ pipe. But I fail to understand how sound wave can reflect at the open end of organ pipe.

(a) When a taut string is plucked with a finger then it starts vibrating with a transverse wave pattern in the string, which causes the air particles in the immediate vicinity of the vibrating string to oscillate. These oscillating air particles will result in a sound wave traveling in 3...

It seems to me though WAV files are heavier than the others in bytes it has the best sound quality. It's interesting since nowadays you can download more quickly (who knows perhaps this is also a lie... :cool: ) files, so why bother for MP3 or FLAC, the good old WAV file is da best! Unless of...

1.) In electromagnetics, wavelength in a medium is $$\lambda = \frac{\lambda_{0}}{n}$$, where $$n$$ is the refractive index. What is the equivalent formula for sound wave in a medium? 2.) Is there a reference sound velocity, like electromagetic wave speed in vacuum is $$c_{0} =...

Would we have to use the 3-dB exchange rate? How would we solve this question?

I got these tuning forks from someone. However, I do not have the resonant box for amplification of the sound. I decided to get it made so that I can experience the fundamental frequency (and other harmonics) more clearly. I am planning to provide this design. In summary, the box would be...

If two people are holding a stick going from the Earth to the moon and the one on Earth pulls the stick, would the person on the moon feel it immediately? This question was answered on Quora and the answer given involves the speed of sound and claims that the person on the moon would not feel...

Homework Statement:: This is from 5 ed, Physics 1Halliday, Resnick, and Krane. page 428 about sound waves I have highlighted the equation that I don't understand. How did the author get it? I understand how they get from the middle side to the RHS of the equation, but I don't understand how...

There are two blocks of apartments separated by a narrow alleyway. Person 1 is in the middle of the room in Apartment 1 (first floor if you are in the UK and second floor if you are in the USA!) and Person 2 is on the ground outdoors in the alleyway. If both people speak at the same volume...

Are there soundwaves so tightly packed that you could have two people standing next to one another and fire sound at a distance directly into one person's ear as that only that person hears it?

##-w1## and ##-w2## are to shift the cosine graph to the right, and ##\frac{2pi}{\lambda}## is to stretch the graph. But I can't seem to draw an appropriate ##y1+y2## graph (quite irregular) and I struggle to find the resultant frequency and wavelength. Also, why is there angular frequency in a...

If two cars are driving side by side at the same speed, their relative speed is zero but do they nonetheless perceive a sound Doppler effect from the other car's siren because of the apparent headwind generated by their speed?

How does sound reflect from interface at an angle? The propagation of light is determined by a single factor - index of refraction. Sound is affected by two factors - speed and acoustic impedance. Take the case of two substances with identical acoustic impedance but different sound speeds - one...