Sound Definition and 1000 Threads

OKay...Loudness of a sound is "the magnitude of sensation of human ear", or ''how much violently ear drum vibrates due to sound wave" (That is according to my understanding)...Now, increasing the area of vibrating body increases the loudness of sound...My question is that, if we increase area of...

Homework Statement 1) find the wavelength of the sound of the tuning fork (cm) 2) what's the vertical distance x from the top of the pipe to the antinode above the pipe (cm) 3) find the frequency of the tuning fork (Hz) Homework Equations velocity = wavelength . frequency for pipe closed at...

Hello, Nice easy question for you all today: I would like to know how the speed of sound in steel varies with temperature. A google search didnt reveal a great deal, so if a physicist could confirm the relationship, that would be much appreciated. I know that: v = √shear modulus/density...

if you and your friend ride a supersonic rocket , do you can listen to your friend voice ? I mean if you travel faster than sound will you can hear anything ,It's difficult to imagine. And thanks so much,

Generally sound waves are depicted as simple sine waves, where volume is related to amplitude, and there is periodic motion. Realistically sound waves aren’t as simple. I attached a picture of a dissipating sound wave. I would appreciate if you guys could answer a couple questions I have about...

i am looking for some ideas on where i can look within physics and engineering to help solve my problem. i want to attenuate the sound blast from a rifle muzzle, however, i want to engineer a large deep room to do it. think of this like a indoor firing range. i know opera stages many times...

Are real non-sinusoidal sound waves, such as square sound waves, always composed of sinusoidal waves? I know that non-sinusoidal sound waves can be created with an infinite number of sinusoidal sound waves as described by Fourier series. Of course real non-sinusoidal sound waves cannot be...

So I am just working with a synth and I am having it create a single sine wave. I am then looking at the output on a db vs frequency graph and I would expect the db to only be reading at the frequency of that sine wave, but there are readings from 20 Hz all the way to 2k Hz sometimes(althought...

I am working on a synthesizer to model sounds like plucked strings (guitars) and struck membranes (drums). With such instruments, the harder you strike them, the longer the sound takes to decay to an inaudible level. What equation would allow one to predict the proportionate time decay of such...

In spite of the prefex I'm not a student, just a very curious person with more than 9 lives to waste :) I have a Golden Retriever but she's never been used as a gun dog. She is terified of loud noises like thunder and fireworks, even a distant firecracker will have her shaking for hours. We...

A bomb explodes on Mars how long will sound waves to travel from Mars to earth?? Ans= 0sec?? or any other answer needs only little hint

Homework Statement A man is wearing a hearing aid device that increases the frequency of the sounds the human ear can conceive, by 30 db. The device "catches" a sound of frequency f = 50 Hz, and intensity I = 3.00 * 10-11 W/m2. What's the intensity that the man's ear hears? Homework...

i work on phononic crystals and i want to find solids with diffrent sound velocities and mass density in diffrent temprature i can just find BST but i need more matherials please help me my friends best regards

Let's say we have a 3 floor/level building , and someone is making noise outside, i.e: Playing guitar, given that all the building has the same sound isolation everywhere, what can you say about the sound propagation? we have 2 cases a) when windows opened b) when windows closed Will the...

Hi, Someone tried to scam me a while back and they were stupid-enough to leave a message in my Android answering machine. Question: Is there a way of turning a phone message into a .wav, .mp3 or other type of sound file? I guess it depends on whether the message is stored in my end or in the...

Homework Statement Suppose a tube is filled with helium gas at a pressure of 0.11MPa and a temperature of 297K. If a piston of area of 400mm2 at one end of the tube creates sound by moving sinusoidally with a frequency of 60Hz, creating a wave with amplitude of 3.8mm, what power goes into (I'm...

This animation demonstrates a longitudinal wave by means of moving bars. I realized that if we increase the amplitude of the wave, the bars will eventually start passing through each other, which sounds (no pun intended) like an unphysical scenario. Does this mean that there is a cap, a...

Homework Statement 2. Homework Equations Doppler's Equation The Attempt at a Solution (1)[/B] freqA = (v sound - vA )/(v sound - v B) . freq B *v A = 0 (static) = V/(V - v) . freq B ...Answer : (d) (2) freq A hear which is reflected sound by D first find freq D, *v D, v A = 0...

Sound is vibration of air molecules knocking into each other. Intuitively, it seems the faster a molecule travels before hitting another, the faster the propagation of sound. Can't you hit air molecules harder, so the air molecules will travel faster and spend less time between collisions, and...

What happens to sound when it hits a vacuum? Because there is nothing for the sound wave to vibrate against, what happens to the energy?

The sound intensity formula is given by: dE/dT*dS. So the variables are energy, related to the amplitude of the wave, area, related to wavefronts distribution on space, and time. So many times I don't see any reference about the relation between frequency and sound intensity, but if time is a...

Homework Statement 1) When sound waves travel through increasing temperature, what increases, frequency, wavelength, or both? 2) When you inhale helium and then your voice becomes high and squeaky, what causes this to happen? Homework Equations Vsnd= √(γRT/ M) vsnd= λf The Attempt at a...

Hi there, my understanding of absorption coefficients is that harder materials generally reflect more sound similarly to how a harder material will result a ball to bounce higher than a softer material. What I am having trouble finding research on and understanding is the reasoning behind the...

Hello. Just wondering how to calculate the sound speed in the atmosphere if I have temperature and pressure from the surface and all the way up to thermosphere?

Hi there, I have a scenario in which different frequencies will be played behind a curtain with a 2m opening. I would like to calculate the angle of diffraction for different frequencies played by the piano. One equation that I came across through research is Fraunhofer's Single Slit equation...

Homework Statement In the experiment for the determination of the speed of sound using a resonance tube, the diameter of the column tube is 4 cm. The frequency of the tuning fork is 512 Hz. The air temperature is 38° C in which the speed of sound is 336 m/s. The zero of the meter scale...

Homework Statement A stereo amplifier is rated at 130W output at 1150Hz. The power output drops by 10.0dB at 15.3kHz. What is the power output in watts at 15.3kHz? Homework Equations R=I/Io Io = 10^-12 w/m2 bel = log(r) The Attempt at a Solution I have no idea where to start

Homework Statement The A string on a violin has a fundamental frequency of 440Hz. The length of the vibrating portion is 32.4cm and has a mass of 0.340g. Under what tension must the string be placed? Homework Equations V = Fλ Vs = √t/μ The Attempt at a Solution I plugged in my info to...

Is it possible for Low Frequency to distort the fabric of space? If so, how?

Homework Statement :[/B] At a prayer meeting the disciples sing JAI RAM .The sound amplified by a loudspeaker comes back after reflection from a building at a distance of 80 m from the meeting. What maximum time interval can be kept between one JAI-RAM and the next JAI-RAM so that the echo...

Hello, I'm curious to know what is creating the sound from this Youtube video assuming all of this is done only with water flowing through the fountain. Thank you very much for your time.

Homework Statement In this part of the lab you tracked a single peak as you moved a microphone in order to get a good value of the speed of sound. This question will lead you through a similar process with just two measurements. (The lab set up: speaker emitting the signal faced one microphone...

I just dropped $1700 on a 4K TV and "wireless" Sound Bar from LG. The setup instructions of the sound bar (6 pictures in a manual 2 pages long), show how to connect them with - optical cable - HDMI Those are the options. How is this a wireless sound bar if it requires cables?? Not that it...

Homework Statement [/B] I was little bit confused about interference word problem in an old physics exam. I managed to ace the problem in the exam, by applying a little bit common sense to it, but I feel like I didn't understand the concept of the interference completely. (Loud)speakers A and...

I = 1/2 ρ v ω2 A2 I don't know what "I" is nor do I know what "A" is but it has to do with sound waves. May you also please correct me if I am wrong but is: ρ = density of air v = velocity of sound = 343 m/s ω = angular frequency of the sound wave = 2πƒ And also may you please answer what is...

Hi Guys, Im new here and don't know much about electronics so please bare with me as I try to explain what I would like to know. If you have a classic design speaker it has a passive crossover inside consisting of mainly capacitors and inductors changing the frequency (or limiting) to send low...

I get from pictures that the waves in front of the craft get closer and closer together until at Mach 1 they are on top of each other and boom! but! after that, the sound waves form a cone... what is that? is that the head of each wave being produced behind the previous wave and then blasting...

can light collectively or individual photons act as a medium for propagation of sound waves?

Is it true that the higher the frequency of sound, the narrower the wave will be?

Imagine that one person is on one side of a hall, and another person is on the other side. There is a gap in the wall that separates the two people. In that case, how is it possible that one person can hear the other person, but cannot see them unless in a direct line with them?

It is usually referred to as Phonons for sound waves in solid. But, where it gets confusing, is in gases and air. Some still call it Phonons, others say, Phonons can only be used in solid states. So what is the Quantum of Sound in Gases/Air? And if possible, refer to any text which speaks of...

If concert environments are saturated with sound, why don't we witness a change in light colours (frequency shift) or reflection or any other effect witnessed in laboratory experiments documenting acoustic-optic effects?

Homework Statement A speaker blares out music with a power of 10 W. Assuming the air has a temperature of 50°F and a pressure of 1 atm, what is the sound intensity level in decibels at a distance of 100m away? What is the maximum pressure variation at that point? What is the distance at which...

Homework Statement I have a mass of 100 g and I want to make it oscillate with a period of 10 Hz. What spring stiffness do I need? Homework Equations f = 1/2π√s/m The Attempt at a Solution I don't know how to find the stiffness to plug into the equation.

Homework Statement Suppose a string is 0.50 m long, it has a mass per unit length of 1.2 g/m, and it is under a tension of 52 N. What is the frequency of the second mode of this string? Express your answer in the SI unit for frequency? Homework Equations f = Vs/2L Vs = sqrt (F/μ) The Attempt...

What is the formula to calculate acoustic absorption in water? particularly sound in the ultrasonic range.

Homework Statement This is a homely. We were instructed to make a monochord and find and mark C5, G4, F4, E4, D4 & C4 by multiplying our starting length with the length rations (C5 = 1/2, G4 = 2/3, F4 = 3/4, E4 = 4/5, D4 = 8/9, C4 = 1) Then we used "Ravenlite" the application to measure the...

Homework Statement P(average) for a speaker is 10 W. Gamma is 1.4 (ratio of specific heats), molar mass is 28.8 g/mol, air temperature is 50F, and pressure is 1atm. Find Pmax at 100 I have this equation that gives Intensity = (Pmax^2)/(2*Rho*v) where rho is density, and v is speed of sound...

Hello, I would like to know whether it is possible to cause a person to enter deep sleep (state as an anesthetic by drugs) by using a specific voice or sound ... Thanks.

Homework Statement Suppose we listen to the sound of a vibrating string with a pickup that is sensitive to the motion at a point 1/3 of the string's length from one end. Which statement is true? A.) We will be able to hear all of the modes except the third B.) We will not be able to hear the...