Sound Definition and 1000 Threads

Hi, easy one but can't really get my head around it. The physics teacher today showed sound as Sine wave on an oscilloscope. If I was actually listening to this sound wave, where would it be silent, on the x-axis or at the trough? Please explain.

Does anyone know how to add more than two coherent sources that have different phases? An example might be a sound source and a receiver with sound reaching the receiver directly and by two reflections via different paths - maybe off a hard floor and hard ceiling. There's a good document...

Homework Statement How does the sound energy level produced by woodwind instruments (a piccolo, a clarinet, and a bassoon) compare to the sound energy level produced by string instruments (a violin, a cello, and a double bass) and brass instruments (a trumpet, a trombone, and a tuba)? I am...

I am trying to understand what the formula v=sq rt( Bulk Modulus/density). I understand that Bulk Modulus is indicative of a Pressure force and shows how much an object resists being compressed. So if we take a solid, it will have a greater Bulk Modulus than a liquid and so sound will travel...

My 2 year old play with the following toy at our home. https://www.amazon.com/dp/B000GKD006/?tag=pfamazon01-20 It is basically, when you put the correct animal block in the correct place, it makes the sound of that animal. I can see some sensor in the wood piece and in the board; it can...

Please solve showing all work asap thanks sooo much How many times more wavelengths occur in air than in water for an air temperature of 10 degrees Celsius if the speed of sound in water id 5220 km/hour and the frequency of sound is 500 Hz. Grade 11, thanks so much please ASAP

I'm working on the mathematically modeled piano synthesizer. Right now I'm using modal based approach, where the sound is formed by a sum of exponentially decaying sinusoids (harmonics). Right now I can calculate frequencies of sinusoids (taking inharmonicity into account, of course). For...

If water is hold inside the water bottle, which is made of plastic, and I play music within the room, can the sound vibration get through the plastic bottle and transfer it into water? Does anyone have any suggestions on what kind of materials to hold the water to get the best transfer rate on...

I'm looking for a 42" - 46" LED HDTV lately, and I keep looking at these TVs on sale that have incredibly low reviews and skipping over them. However, upon reading the "bad reviews" it seems everyone is saying "TV is fantastic, but the sound is bad." Here's just one TV for example...

Homework Statement A sound source A and reflecting surface B move directly towards each other. Relative to the air the speed of source A is 29.9 m/s, the speed of the surface B is 65.8 m/s and the speed of sound is 329m/s. The source emits waves at frequency 1200 Hz as measured in the source...

Homework Statement Using the equation P=m/V show that the equation PV=nRT can become P/p=(R/MW)T P=pressure p=density of air n=number of moles of gas R=gas constant T=temperature m=mass V=volume MW=mass of one mole of air Homework Equations P=m/V PV=nRT P/p=(R/MW)T The Attempt at a...

When the wavelength is bigger than an obstacle, then the sound waves bend around the obstacle. so why I can't imagine this at all I read this page and watched the animations of it but it doesn't tell me the answer http://www.acoustics.salford.ac.uk/feschools/waves/diffract.htm reflection of...

I have done the hardware implementation using the planned schematic below. but somehow no sound seem to be able to play from the speaker except some noises. Anyone can help me check if something is wrong with DAC shematic...

Hi This is probably simple but i just can't seems to work it out: assume no gravity or friction: car 1 traveling at a constant speed of 50m.s in one direction Car 2 traveling at a constant speed of 50m.s on top of car 1 in same direction car 3 traveling at a constant speed of 50m.s on...

1. For this question, I need to explain why sound waves emitted into ocean water sometimes fail to give accurate results. 2.I have thought about, the salt density and the waves traveling through different water temperatures, but need to expand on these two ideas and don't understand it enough to...

Hello, I have read that vacuum cleaner makes 70 dBa and earplugs can easily go beyond this. The problem I have is that I can hear my neighbor's vacuum cleaner thru wall easily. But if I set my mp3 player at max (should be around 100dBa according to manufacturer) I can heard this at few...

I am taking a physics class and need to explain why we can hear better at night than during the day.

I understand the inverse square relationship between sound intensity (I) and distance (r). There was a misunderstanding in physics class today about the mathematical and theoretical relationship between sound intensity and power according to the equation: I = P/4∏r2 Sound intensity is...

Why can't sound pass through closed doors?

How is sound able to be transmitted through the air with such extreme clarity. What I find puzzling is that air has no stiffness to it at all. There are just countless numbers of molecules traveling at the speed of sound in random directions. How can a single speaker cone set up pressure...

Hi friends, I need the average speed of sound in some common solids, such as Si, Cu and Al, over temperature ranges from 100K to 500K. After 5 hours of surveying acoustic and physical properties handbooks and googling the web, what I find is almost nothing. Does anybody know a...

Homework Statement The intensity of the sound from a certain source is measured at two points along a line from the source. The points are separated by 11.8 m, the sound level is 68.10 dB at the first point and 60.31 dB at the second point. How far is the source from the first point? d =...

The intensity of the sound from a certain source is measured at two points along a line from the source. The points are separated by 11.8 m, the sound level is 68.10 dB at the first point and 60.31 dB at the second point. How far is the source from the first point? Know: I = P/A =...

I'm trying to understand relativity on a simple example: 2 objects A & B moving in exactly opposite directions at 0.6c each, starting from frame C at the center of things that remains stationary. So, we have: W <----0.6c A ...... C ..... B 0.6c----> E 1. From frame C, A is moving...

Light waves, photons; sound waves, phonons; water waves, "hydrons"? Light waves are made of photons; sound waves are made of phonons; so are water waves made of "hydrons", and if so, how would they behave, and would it be possible to make a water laser or something similar based on these particles.

When swimming underwater, why does sound from above the surface sound very faint? I know that the answer to this may be simple, but I just can't put my finger on the answer. I know that sound travels faster in water then it does in air, does this fact have anything to do with it? Thanks!

I didn't follow the template because this is more of a conceptual question that I can't get a clear answer for. I understand that sound intensity varies with 1/r^2 because the total intensity at a point in the wave is constant and if you have spherical propagation then the area of the surface...

Why is it that materials with a higher bulk modulus value allow for sound waves to propagate through them faster? A material with a high bulk modulus requires a relative greater increase in pressure to contract by the same volume as a material with a lower bulk modulus, and as such sound waves...

I don't have any specific numerical values for this, as it's a general question, but hopefully I explain it well enough using only words: If you plot a graph of position vs. flight time (of a sound pulse, for example), what is the slope of that graph going to be? (That is, what does the slope...

Hi everyone, I've been reading quite a few papers on the study of sound radiation, and a common system that is studied is described as a "baffled plate". What exactly are the boundary conditions on a baffled plate? I thought it was simply that the edges have a pinned boundary condition, i.e...

Homework Statement What is the wavelength of a 25 Hz sound wave? What is the wavelength of a 4.5 kHz sound wave? Homework Equations wavelength = velocity / frequency or λ = v/f The Attempt at a Solution I know that I'm supposed to plug the 25 into the equation, but he didn't give...

Hello! I am a recent university grad, majored in physics, with a strong background in programming and maths. I've had a couple non-physics research positions, and am looking to go back to school for a masters. All my life I've been very passionate about music, from composing classical...

Homework Statement Determine the speed of sound in argon gas at 30 degrees celcius. Argon is a monoatomic gas with atomic mass 40. Assume adiabatic and ideal gas conditions. The mass of a nucleuon is 1.67*10-27 kg=mp. Homework Equations Adiabatic constraint: pVγ=constant. Ideal gas...

hello, since a while my mind is caught by an idea. This idea is concerned with underwater sound massage system. For this purpose i would like to build an array of underwater sound transducers, which can all be steered individually (to do a coarse beam forming). However, since i am...

I don't recall ever trying a mystery sound competition. So, in the fashion of other competitions, whoever can name the source of the sound picks out the next mystery. The imagery in this video is irrelevant and not intended as a clue or a false lead...

Homework Statement You see a neighbour in a cottage across the lake chopping wood. He is 2 km away and you see that it takes 2 s to hear each chop after you see it happen. Calculate the air temperature. (v= 332+ 0.6 T) Homework Equations v=d/t The Attempt at a Solution v= 1 km/s...

why is sound heard more clearly in night than at day?

Like on a hot day, cars make these clicking sounds on the surface? Does having a silver or white-colored car make it worst? Because I've seen black -colored ones do that too

Okay, I have this problem worked out, but I have no clue if my answers are right. Could someone please check my work and give me some confidence or show me where I may have messed up. Homework Statement Two loudspeakers, one of them generates sound with 400 W power the other with 100 W. The...

http://arxiv.org/abs/1108.4389 Gauge Theories Labelled by Three-Manifolds Tudor Dimofte, Davide Gaiotto, Sergei Gukov (Submitted on 22 Aug 2011) We propose a dictionary between geometry of triangulated 3-manifolds and physics of three-dimensional N=2 gauge theories. Under this duality...

can we hear the sound of our steps in moon?

So, I'm writing a music A-Level dissertation, but because of my love for physics, I've based it on the physics of sound. I didn't think this should go into the homework section because it's not so much homework that I need help with. Whilst working through some fundamentals on my board, I...

when light rays fall perpendicularly on a separating surface between two media it doesn't refract according to Snell's law and it is the same with sound waves how to prove something like that mathematically?? Thanks in advance

what is the mechanism of small holes in auditorioms used as sound absorbers

Homework Statement I am writing my Extended Essay for IB, where I look at the possibility of obtaining accurate results in open system of a school, by accounting for all energy losses that occur during the investigation. Before conducting my experiments (which included an air track with two...

I am doing a module to adjust the noise in a motor such that motor inside piston stroke is touching some mechanical part leads to small noise. I would like to adjust these by using sound sensoror presser or vibration sensors. I don't know which one to use in that sistuation but my guess is sound...

1-why does sound intensity increase at night? 2-what makes diffraction of sound more observable than diffraction of light? 3-reflection of sound takes place when it falls on a reflecting surface whatever the distance between the vibrating source and the surface but in case of echo there are...

ive got two basic questions. 1: Does density effect viscosity, as in is it possible to have a highly dense but low viscosity fluid and vice versa. 2: I know in space there's no sound but can you hear your own heartbeat and other internal vibrations?

Homework Statement A student holds a 325.6 Hz tuning fork near the end of a pipe that is closed at one end. He notices that resonances can be heard for several different lengths, one of which is 55.5 cm. He gradually lengthens the pipe to 92.5 cm where he detects the next resonance...

Homework Statement Henry and Tom see a flash of lightning and then hear the resulting clap of thunder. Henry measures the sound level of the thunder as 65 dB while Tom, who is 800 m further from the event, measures it as 63 dB. Homework Equations The Attempt at a Solution I_H /...