How is sound measured?
400317
If you want to measure the volume of sound, it is measured in decibles.\n\nIf you want to measeure the width or band or sound it is measured in Hertz or mega hertz. For this you need an oscilla scope.
298529
If you know the density of the material, you can measure it's volume.  D = M / V.  Therefore, the mass equals the density of the object times the volume.  The weight of the material is its mass times gravity.
82021
I wish your question was stated more clearly. Do you have sound data? From a microphone? \n\nOne of the things most often done is to estimate the spectral content of the data. If ou are inexperienced, which you appear to be, I would start with a standard direct periodogram estimate. \n\nSubtract the mean from your data. Take a discrete Fourier transform of the remaining data (it is easily done with the FFT algorithm, if the data are sampled at uniform intervals). Plot the modulus squared of the result. \n\nThere is a tremendous amount of sophisticated analyses done on sound samples. It is way beyond the scope of yahoo answers to be able to give much detail. You should do some research and reading in the library and on the web if you want more.
788507
If you have a video camera and good editing software (iMovie), you can measure the speed of sound. Have a friend set off a firecracker a long distance away, and tape it. Then count the number of frames between the flash and the bang.
850732
If you can measure the *frequency*, you know the wavelength.\n(As the wavelength is just the frequency divided by the speed of sound.)  I found a calculator that does this for you:\nhttp://www.sengpielaudio.com/calculator-wavelength.htm\n\nIdeally you would get an oscilloscope to measure the frequency.\n\nIf you don't have access to one, if you have a guitar tuner, you could measure the frequency (the tuner will tell you the pitch, say A#, and you can look up the frequency of that pitch in a music book).\n\nOr if you have a bunch of tuning forks or a pitch pipe, you could get an approximation.\n\nIf you have an ocilloscope, don't forget to get the precise speed of sound at your elevation (sound travels a bit faster at sea level, than if you live in, say, Denver).  (Note that the calculator link above gives you a place to enter the speed of sound where you live.)  If you're using a guitar tuner or tuning forks, they are only approximations anyway, so the exact speed of sound for your elevation won't make a difference.  \n\nP.S.  I found a reference to a sound analyzer you can get for your computer!  The software is free, but it needs a soundcard in your computer (which you probably have).  It uses the information from a microphone in your computer to give you the frequency and wavelength of the musical note.  It's kinda cheating if this is for a science-fair project ... but maybe this is what you want.\nhttp://www.relisoft.com/Freeware/freq.html
924840
sound is the vibration of the air and it's relationship to the ear drum.....no air.......no sound
29871
60 dB sound pressure level is about the level of an ordinary conversation.  See source for more info.
253367
What are u measuring?
906307
From wikipedia:\n\nFor sound intensity, I0 is typically chosen to be 10^−12 W/m2, which is roughly the threshold of hearing. When this choice is made, the units are said to be "dB SIL". For sound power, P0 is typically chosen to be 10^−12 W, and the units are then "dB SWL".\n\nThe value of 56.0 db is derived from the formula\n\ndb = 10*log(I/I0)\n\nFor 56 db, I/I0 = 10^5.6  From the above reference,  I0 = 10^-12 W/m^2;  Therefore I = 10^5.6*10^-12 = 10^-6.4 W/m^2\n\nSince the distance from the source was given in your problem, perhaps it meant "power level" rather than "intensity level".  If that is the case, you would figure the power using the formula\ndb = 10*log(P/P0), just as above, except that P0 is 10^-12 watts.  To get intensity at point A, divide by the spherical area at that point A = 4πr^2, where r = 3.8m
810751
The speed of sound in water (including seawater) depends on several factors, but most important is the the temperature of the water.  By measuring the time it takes for an acoustic signal to travel from a source to a receiver, one can determine the average temperature along the path followed by that sound signal. (Other factors that include sound velocity or travel time include salinity, pressure (i.e. pressure-induced changes in density), and ocean currents.)  By measuring the average temperature along many different paths, one can reconstruct a 3-dimensional "map" of the temperature distribution in the oceans.  \n\nBy following the changes in temperature over time, one can detect long-term changes in the temperature distribution and hence average temperatures of the oceans.
950075
The speed of sound through water is fixed, and the ship bounces sound signals off the sea bed using a depth sounder. It measures the time elapsed between the sound leaving the ship, and its reflection from the sea bed returning. Knowing the speed the sound is travelling at, it is then possible to work out the distance travelled which, when divided by 2, gives you the depth.
782952
20Hz- 20kHz (audible frequencies)\n< 20Hz (infrasonic)\n> 20kHz (ultrasonic)\n\nlongitudinal wave - sound wave\nthe rest are transverse waves
1166160
give me a minute to grab my decibel meter and tie it to Bessie's butt......\n\ncome on ....\n\ncome on .... \n\nrip one girl....\n\nBRTHFFFFFFDFD\n\nalright now let's see\n\nWow 78db spl at 6 inches. With that information you can calculate acoustical power.
869709
Tell us what you mean, and perhaps we can tell you how to measure it.
362546
Sound is a pressure wave. When it hits a surface the pressure wave is sensed as a force wave. Although weight is a force, the force caused by sound is not weight since it is continuously varying about a mean of zero.
971127
The sound intensity due to a point source radiating equally in all directions (spherically symmetric case) is proportional to 1/r^2, where r is the distance from the source of the sound:\n\nI = k/r^2, where k is a constant of proportionality.\n\nIf we know the intensity (I1) at one distance (r1), then the intensity (I2) at a second distance (r2) is given by:\n\nI2 = I1*(r1/r2)^2\n\nIn Q1, we are told that the sound intensity at 1 m is 10^-5 W/m^2, and we want to know the intensity at 5 m.  Plugging these values into the above equation, we have:\n\nI2 = 10^-5 W/m^2 * (1m/5m)^2 = (10^-5 W/m^2)/25 = 4*10^-7 W/m^2\n\nThe intensity of a sound wave is proportional to the square of the amplitude of the displacement of a particle in the medium through which the sound is propagating:\n\nI = m*x^2,\n\nwhere m is a constant of proportionality, and x is the amplitude of the displacement.  Plugging this into the equation above that relates intensity and distance, we have that:\n\n(x2)^2 = (x1)^2 * (r1/r2)^2\nx2 = x1*r1/r2\n\nThe amplitude of the displacement is inversely proportional to 1/r.\n\nFor Q1 we are told that x1  = 70 microns at 1 meter, and are asked what x2 is at 5 meters.  Plugging these values into the above equation, we have:\n\nx2 = 70 microns * 1/5 = 14 microns\n\nFor Q2, we are told that x1 = 10^-7 m at r1 = 3 m, and are asked what the amplitude is at 5 m.  Again plugging these into the above equation, we have:\n\nX2 = 10^-7 m * (3/5) = 6*10^-8 m
416424
Decibels refer to the strength or loudness of a particular sound.\n\nA decibel value for sound can be calculated by the relation\n\n                 L_p = 20 log (P/P_0)\n\nWhere:\n* L_p is the decibel value\n* P refers to the pressure amplitude (Pressure amplitude refers to the measure of the variation in air pressure caused by a sound wave)\n* P_0 is the pressure amplitude for the treshhold of hearing (meaning the pressure amplitude value for the weakest sound we can hear).  This value is commonly accepted at 2 x 10^-5 N/m^2\n\nFor example:\n\nif the pressure amplitude was 0.5 N/m^2, what's the decibel reading?\n\nso, L_p = 20 * log (0.5/(2*10^-5))\n        = 20 * log (0.25 * 10^5)\n        = 20 * log 25000\n        = 20 * 4.4 (approx)\n        = 88 dB