wht is the frequency of sound tht we cn hear?
400150
The range of frequencies that humans can hear is approximately between 20 Hz and 20,000 Hz.
792662
Frequency = velocity of propagation / wavelength.\n\nFor light, we assume it is moving in a vacuum, so vp is 3e8 m/s.  The wavelength of 310nm is 310e-9 meters.  Then we plug the numbers in, and we get (3e8 m/s) / (310e-9 m) = 967.742e12 Hz because 1/s is the same as cycles/sec, which is a Hertz.
843905
20 micropascals or 0 Decibels. According to wikipedia, this is about the loudness of a mosquito flying 3m away. That's pretty quiet.\n\nThere is however a frequency dependence, and old people obviously don't hear as well, but 20 micropascals is the standard value.
129024
ohm, or om is correct. om is supposedly the sound vibration when the universe was created
119936
You need to know the mass of the earth and it's natural freqeuncy. The answer is usually about 10 Hz. It goes "dong" at about ten times per second, as opposed to the human ear, which can start to detect "dong"s at 2000 Hz.
216287
I think you're talking RF not audio and the given C value sounds just fine. We pretty much agree except for the decimal point, unless you are using a comma for the d.p.\nI get f = v/lambda = 299792458/5.7 = 5.259517E+07 Hz, \nw = 2*pi*f = 3.304652E+08 rad/s, and \nL = 1/(w^2*C) = 1/(1.092072E+17*1.9E-12) = 4.819422E-06 H or 4.819 uH.
752428
Generally from 20 - 20,000 HZ depending on the individual. We lose some high end range as we age
168920
This is ultrasonic, not electromagnetic, so C is irrelevant.  The equation is:\nF=V/L where V=sound velocity in water (~1475 m/s), F=frequency in Hz, L=wavelength (0.0003 m)\nResult is you need 4.9 MHz or higher.
1103257
When source of sound is far away, the sound energy is dissipated while reaching us. That is its amplitude decreases. When it is nearer sound energy falling in our ear is large (amplitude is large) and hence volume of sound heard is high.\n\nThe above phenomenon is when the source of sound is stationary. But when the source is moving toward or away from us, other than the above the pitch (frequency) of sound varies.\n\nThis is because we determine the pitch of sound by the number of waves falling in our ear and not by the actual number of waves emitted by the source.\n\n Suppose that the siren is sending a pulse of sound every second and is moving away from us.  It takes some time for the first pulse to reach us when the siren is some distant away from us. The second pulse has to travel some more distance to reach us than the first pulse, because the source has moved some distance during this time.\n\nThus the number of waves falling in our ear drum has decrease and hence the pitch is also decreased.
375258
Babies may be able to hear out to 30 or 40kHz.\nA very few adults can as well. Older adults have a hard time hearing anything above 4kHz (there is a small drop in everyone's hearing around 4kHz).\n\nThe 20 to 20kHz thing came about as a "statistical norm" in testing hearing many years ago.
910771
"Both light and sound are waves." "and is there a physical analogous comparison of light waves to sound waves?"\n\nYes they are both waves. However, light is known as an electromagnetic wave which is a propagating disturbance of both the electric and magnetic field in space. Sound however is a pressure wave transmitted through a medium. Light waves are transverse meaning the direction of travel is perpendicular to the direction of oscillation. While sound waves are longitudinal meaning the direction of travel is parallel to the direction of oscillation. Another difference is that light waves DO NOT need a medium of travel (they can go through a vacuum) however sound waves exist only in a medium.\n\n"Sound is measured in Hz. how are light waves measured?"\nYou are correct, one measurement of sound is in Hz. However, waves have 4 unique properties. Velocity the rate that it propagates which is measured in m/s. Frequency, how many times the wave repeats itself in a period of time measured in Hz. Wavelength, the distance between complete cycles measured in meters. And finally, Amplitude or Intensity which is measured in decibels or W/m^2 which measures how high the crests become and how low the troughs become. The larger the amplitude the higher the peaks and lower the valleys. This is also measured in meters. Higher intensitys is proportional to the amount of energy the wave has. \n\nAs far as measuring a light wave, we usually measure the intensity and either the wavelength or frequency of the light wave.  The wavelength of light and sound is inversely proportional to the frequency because the velocity is fixed to the speed of sound 343 m/s or the speed of light 3.00 x 10^8 m/s.  \nThe higher the frequency of light, the more the light moves to the purple end of the spectrum (think about the rainbow). The human eye typically picks up light between 390 (purple) nm - 970 (red) nm\n\nvelocity = wavelength * frequency.
302444
sound-330m/s in air medium\nlight-299,297km/s
78979
None, sound is a wave not a particle. Sound is just a wave of vibrations travelling through atoms.
1097080
a)\n\n(change in frequency)/(recorded frequency) = (Speed of emitter)/(wave speed).\n\nChange in frequency = 22 Hz\nRecorded frequency = 820 Hz\nSpeed of emitter = what you are trying to find.\nWave speed = speed of sound = 340 m/s\n\n(22 / 820) x 340 = 9.12 m/s\n\nb)\n\nThe frequency of the echo is (I'm guessing for this one sorry) double the regular frequency, which is 1684 Hz.\n\nc) \n\nThe frequency heard by the man is 820 Hz by definition isn't it? Thats the frequency as the boy passes anyway.\n\n[EDIT] Wait I just realised your whole question makes no sense. Due to the limited info in the question I was assuming you meant it falls to 820 Hz from the emission frequency at the point where the boy passes the man. But why would the frequency fall? The point where the boy passes the man is the point where the frequency experienced by the man is highest.\n\nOh well I hope my answer helped a bit anyway.
1029477
Frequency = Number of Cycle per Second\n\nThe unit of measure is in Hertz (Hz)\n\nFor example, our A.C. power line is 120V/60Hz and in some countries 240V/50Hz\n\nThe Musical Metronome also counts the number of beats per second, for example 60 beats per second.
464632
(1) The Sound is a  physical phenomenon that stimulates the sense of hearing. \n(2) In human beings, hearing takes place whenever vibrations of frequencies between about 15 and 20,000 hertz reach the inner ear.\n(3)  The hertz (Hz) is a unit of frequency equalling one cycle per second. Such vibrations reach the inner ear when they are transmitted through air, and the term sound is sometimes restricted to such airborne vibrational waves. Modern physicists, however, usually extend the term to include similar vibrations in liquid or solid media. Sounds of frequencies higher than about 20,000 hertz are called ultrasonic
587485
Frequency. That is what it is all about, not decibals(loudness).Light and sound and radio....they are all waves, and sound carries a signature wave frequency. Some high frequencies cannot be heard by the human ear, even though our bodies and even voices produce high-frequency sounds we cannot hear all of the time. Did you ask the flatulence question as well? That applies in some rare occurences as well. Children can hear some frequencies that adults cannot. There is even a device sold that emits this frequency to annoy and chase off children and loitering teens. (It has been in the headlines recently because some adult humans can still hear this frequency well into their 30's.)\nUnless you asked this Q wrong, there is no sound too loud to be heard unless the eardrum is blown instantly.Very loud sounds are usually felt too in vibration, so even if you're eardrum blew you would still feel it and thusly "hear" the sound as a fully deaf person would.