Acoustics is the interdisciplinary science that deals with the study of all mechanical waves in gases, liquids, and solids including vibration, sound, ultrasound and infrasound. Applications of acoustics are for instance the audio and noise control industries.

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Book recommendations on physics of music and musical instruments [duplicate]

I am pursuing a degree in Mathematics and have a strong interest on music. I would like to understand the physical basis of how is music made. Does someone know some bibliography on this subject?
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35 views

Is the speed of sound observable without tools?

Many times, I had already had the impression that what I was hearing was desynced from what I saw. Could this be caused by the speed difference between light and sound? Or is sound still fast enough ...
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How fitting is the sound wave (transverse wave) propagation model? (for the layman)

Air is a gas, then how is sound wave propagation possible? I mean, gas particles have a tendency to travel in a straight line, so how does a sound wave occur via compression and rarefaction? Most ...
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Is it possible to generate deep infrasound with subwoofer and a pipe?

I would like to check if infrasound noise can make people feel weird (as in a "haunted" house). Some people claim that noises of such frequency may be the cause of "paranormal" sensation in humans. ...
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Sound frequency and power

Although I have studied physics I am not clear on this question: Given that two (or more) sound waves have the same amplitude does the power they carry depend on frequency? What about electrical AC ...
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Ultrasound Transducers and Simulator [closed]

Presently I am working on Underwater Acoustic Wireless Transmission. I desire to measure water parameters at the bottom of the surface of the water and then pass it to the water surface using ...
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70 views

Outdoor noise 55dB, how loud will it be (on average) 10-12 feet away?

If an outdoor air conditioner component that makes 55dB maximum noise at high speed operation, how far away would a neighbor have to be to not hear it?
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31 views

Does air have a maximun supported sound intensity? [duplicate]

It's probably a stupid question, but I wonder what the limit of intensity is that sound can have in the air. I suppose that there's a limit, because very high pressures produced by the sound wave ...
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19 views

Standing waves and acoustic levitation

i am doing a new personnal project about acoustic levitation with standing waves into ambiant air using a piezo ultrasonic tranceiver and a reflective pannel. I modelised both of the emission and the ...
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Does the distance between tines affect sound of tuning fork?

Tuning fork handles act as clang-mode wave nodes. Therefore, I postulate that by symmetry the distance between the tines should not affect the frequency nor the volume. Let us neglect here ...
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What's happening to my metal pot that makes boiling water so noisy?

When starting a fire in a metal wood stove, you can often hear the metal "ping" slowly at first and then faster as the stove heats up. Once the stove has been running for awhile and has heated up, the ...
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57 views

Can every single sound ever made(from the beginning of time) be recreated again?

Sound is a wave and energy decreases as $1/r^2$ . The intensity of sound is proportional to $(amplitude)^2$ of the wave. So if we amplify the wave with some instrument then we can hear every single ...
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188 views

Sound Intensity and Frequency Relation

The intensity of a wave is proportional to the square of the amplitude of the AND the frequency of the wave given by the equation: Now when talking about sound waves the sound level of a noise (...
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How is a human voice unique? [closed]

Well, I am quite new to concepts of vocal sounds. From the physics point of view I believe a sound has two basic parameters i.e, frequency and amplitude. Considering the end sound wave produced by ...
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35 views

factors that affect energy of a sound wave?

Putting a lot of energy into a transverse pulse will not effect the wavelength, the frequency or the speed of the pulse. The energy imparted to a pulse will only affect the amplitude of that pulse.why ...
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59 views

Why doesn't frequency of a sound wave reduce with time?

I understand how energy depends on amplitude as this source says but this source mentions that the energy of a sound wave depends (maybe "also on") on frequency of the sound wave. If energy of a wave ...
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46 views

Effect of temperature on speed of sound [closed]

Formula for calculating speed of sound in dry air is $$V(t)=V(0)+0.61t$$ The temperature here is always taken in Celsius .Why don't we use kelvin?
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60 views

Why does wind sound the way it does?

You can obviously hear wind. From everyday experience, the stronger the wind, the louder its sound. But this sound is always similar, and quite distinctive, noise-like. Can one compute the spectrum ...
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how much time it takes for a flute to start making sound?

sound as i understand is created in a flute by ; the compressions imparted to the air inside the flute . the blowed air is also sometimes not allowed to enter the flute due to its regular contact with ...
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292 views

How does a flute produce its sound?

if an object for instance does not create successive compressions and rarefactions in air but only creates continuous compressions would we be able to hear these compressions as sound ? Yes , because ...
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Why doesnt steady flow of air create sound? [closed]

When one exhales air by twisting the lips appropiately , one does not create enough sound . But when the same amount of air with the same pressure is blown in a flute or whistle , a relatively audible ...
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138 views

Normal Modes for Standing Waves in 1-D Acoustic Ducts with Arbitrary (but real) Impedance Jumps

Let's say we have a 1-D duct, such as this: Where $Z_i \equiv \frac{P}{US}$ is the acoustic impedance, L is the length of the duct in question, and S is the area of the cross-section. In general, ...
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51 views

group velocity of acoustic waves

One can find the sound speed for the acoustic waves as follows: $\frac{\partial p}{\partial t} = -\nabla \cdot \rho \vec v$ (1) $\rho (\frac{\partial \vec v}{\partial t} + (v \cdot \nabla)\vec v)= -...
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Can you simulate a Michelson-Morley experiment with sound?

Is it possible to make a MME with sound waves? Suppose we travel on a rail platform with two "mirrors" that reflect sound, what parameters would we need to simulate the light experiment? would it work ...
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83 views

Why is root mean square pressure used in the definition of sound pressure level?

I dont understand the way we measure loudness. I know that it is in some way related to the magnitude of pressure variations. please help me figure out where my understanding fails. Let $p(t)$ be the ...
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120 views

What would the “physics” of this theoretical instrument be?

Note: I've asked questions about acoustics before in the Music Stack Exchange, but I was told it would be a better fit here. I've invented a theoretical instrument in which you have a tube that you ...
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Is the range of frequency we hear dependent on the natural frequency of our ear?

Is the range of frequency we hear dependent on the natural frequency of our ear? (i guess the question is clear enough. Just writing to meet "quality standards".)
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Averaging SPL from multiple sources, arithmetic mean or averaging decibels method?

I have measured SPL in dB(C) at several sources across a county. I am trying to model the propagation of sound from these sources and plan to use a general average of source sound using my source ...
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29 views

Non-Audio Microphone

Sound is simply vibrations travelling through the air. Would it be theoretically possible to listen to sounds through some other mechanism like infra-red or some fancy form of imaging?
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35 views

Relation between the direction of propogation of sound and loudspeaker's diameter

Sound waves from a conical loudspeaker spread nearly uniformly in all directions if the wavelength of the sound is much larger than the diameter of the loudspeaker. Sound is essentially ...
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47 views

Why do the tones differ when tapping on a different part of a coffee cup?

Let's say we have a coffee cup as shown below. The cup is, in contrast to what's shown on the image, empty (I had some trouble finding free good-quality top-view coffee cup images). When we tap on $...
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Would you hear a gravitational wave, if its amplitude and frequency were suitable?

If there was a source of a continuous gravitational wave at (say) 50hz, and amplitude of say a micrometer (a typical sound wave displacement, I think), and you were nearby (standing happily on a ...
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Gravitational waves parallel

Just an idea to illustrate the gravitational waves. This kind of analogy is proposed: When you have a rotational motion of the fluid, some small amount of the energy is radiated as a pressure ...
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Why is sound reflected and not transmitted through a wall?

We know that speed of sound is higher in a denser medium. So when a sound wave strikes a wall, why does it echo instead of passing through it with a speed faster than the speed of sound in air?
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54 views

What is the nature of ocean waves in DEEP water? [closed]

My book says that it's both longitudinal and transverse, if yes then how?
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47 views

Best frequency for Underwater Transmission

What is the best frequency of transmission of under the water for communication with good data rate? I have read that the threshold of hearing underwater is around 170 to 180 db. Can this be useful in ...
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173 views

Producing an audible sound from the gravitational waves of the GW150914 event

As is said in the latest LIGO press realease, the detected gravitational waves vary with a frequency that is audible for us. The audio one can obtain from the detected data is actually plaied during ...
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Simulating open water acoustics in a tube

For the purpose of testing an underwater acoustic transmission it is possible to use a tube filled with water with a transducer at one end and a hydrophone at the other. The problem is that sound will ...
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How to arrange a 3d cymatics experiment?

Various researchers have filmed levitating polystyrene using sound waves. If i were to take 3 speakers and attempt to visualize the standing wave fields formed by the three speakers, how would i do ...
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43 views

Are there materials that are opaque to infra sonic waves?

I have read that infra sonic sound waves because of their large wavelengths pass through most materials largely unabsorbed. However, are there materials that absorb infrasonic waves(could be frequency ...
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68 views

If you play more than one music track at once on a computer, does the sound heard get louder?

Say you are using a computer and have multiple Youtube videos playing music (or any other video) at the same time, does the sound produced by the computer's speakers (or a pair of headphones) become ...
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113 views

What state of matter is thunder? [closed]

I know of solid, liquid and gaseous states of matter but what state of matter is thunder? Is it gas, liquid or solid?
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theoretical echo from a point scatterer

How can I compute an echo coming back from a point scatterer? Let's say I know the excitation signal (plane wave), scatterer position, medium properties, what else do I need to see, how the echo will ...
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47 views

Sound insulation, absorption and diffusion. Can they be part of the same process? [closed]

I understand that insulation, absorption and diffusion in acoustics are different concepts. Notwithstanding, would it be correct to assume they may be part of the same process when all are used to ...
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59 views

How does electrical energy gets converted to sound energy?

I have seen that inside headphones there is a magnet with a coil of thin wire around it. There must be longitudinal waves coming out of it that is why we can listen to audio. There must be pressure ...
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234 views

Why are the closed and open ends of an organ pipe nodes and anti nodes?

Here is a diagram of a wave in an organ pipe you'll find in most physics books Waves in air are longitudinal (not traversal), so what do the curves represent? Why are the open ends always anti ...
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52 views

Can Acoustic levitation be used to contain antimatter?

Can Acoustic levitation be used to contain antimatter? To me, It sounds like an obvious use of the phenomenon, but I didn't find any documentation about anyone trying this on the web, which could ...
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60 views

A sound that always seems to come from behind you

Many years ago I heard a radio broadcast featuring a beeping sound that always seemed to come from behind me. The announcer said that the sound would have this quality and it did, even when I turned ...
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134 views

Why we cannot hear ourselves or speak in water

I've tried several times to shout when I'm inside the pool but have failed to make any sound. Nor am I able to hear anyone talking outside. Why does this happen? The frequency does not change and ...
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Effective medium approaches - Volume averaging vs homogenization?

In dealing with multiphase two phase systems as an effective medium there are two approaches that can be taken. Volume averaging and homogenization. Volume averaging is very intuitive, just take ...