what is the shortest wavelength a human can hear?
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.
78979
None, sound is a wave not a particle. Sound is just a wave of vibrations travelling through atoms.
663538
The speed of light and other EM waves (in a vacuum) is:\n299,792,458 meters per second\n\nThe speed of sound (at sea level) is:\n340.29 meters per second\n\nThe ratio is 880,991 times faster.\nThe difference is 299,792,118 m/s faster.\n\nOr the simple answer is about a million times faster.\nThe even simpler answer is *lots* faster!\n\nThis also explains why you see far away lightning long before you hear the thunder clap (except in the movies).
283342
Although we can't hear the sound the sun makes in a usual way from earth -- since sound can't travel through the vacuum of space -- we can make measurements of how portions of the sun are rising and falling and deduce what vibrations must be going through the sun because of this.  These vibrations are equivalent to sound, though at a much lower frequency.  For instance, middle C on a musical instrument vibrates the air back and forth 256 times a second.  For one vibration on the sun to go back and forth typically takes 5 minutes.\n\nSo the vibrations are at a frequency far below what human hearing could pick up, but if you multiply the frequencies to bring them into the range of what we can hear, the site below lets us listen to what the sun would then sound like.  Click on the "Hear the Sun Sing" link when you get there.
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
227870
Firstly they have a coned ear which basically can be turned to the direction of the sound, thus collecting more soundwaves than the human ear. \n\nThen the frequency of sound they can hear. Humans can hear any sound in the frequency band of 20Hz to 20000Hz. Anything above or below is inaudible to human ear. On the other hand are much more broader extending high and low to the human audible range.\n\n.:Fishie:.
376222
As the wavelength goes up, the energy goes down. So blue is most energetic and red is least.\n\nHomework?
932169
Gamma rays have the smallest wavelengths and the most energy on the electromagnetic spectrum. There isn't much physical difference between gamma rays and x-rays besides the fact that the gamma rays vibrate faster. They measure 10 to the negative power of 11 all the way to 10 to the negative power of 14 (meters). I hope I've answered your question. My knowledge of the electromagnetic spectrum only extends so far.
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.
219782
Directly from the websites below!!\n\nTransmitted light (from the sun, light bulbs, fire, etc) is made up of a spectrum of colors. The longest wavelengths of light are on the red end of the spectrum and the shortest wavelengths are on the blue/violet end of the spectrum.\n\nWhen transmitted light such as sunlight enters our atmosphere it collides with the oxygen and nitrogen atoms. The color with the shorter wavelength is scattered more by this collision. Because violet and blue are the shortest wavelengths the sky appears to be violet / blue. But because our eyes are more sensitive to blue light than they are violet light, we perceive the sky as blue.
521771
Red.  It is of relatively low frequency in relation to other discernible colors, and has a wavelenght between 630 and 760 nm.  That is the only way you can expalain a color to a blind person if they were blind from birth.
1169047
good grief - there is a lot of 'part' knowledge here...\n\nyou need to break this down and talk about the different parts of what the original question was asking.\n\nif it was 'see', the explanation would be the same as for hearing by the way. (it would be easier to explain about seeing)\n\nhere goes...\n\ninside your ear you have these little hairs (cillia) that are a certain distance apart. when a sound wave enters the ear the wavelength of this wave will stimulate hairs at both its high energy points (its troughs or peaks, you choose, not important) your brain knows the distance of the hairs and so can interprut this wave distance between two lots of hairs being stimulated. thats how you get the frequency (number of wavelengths in a second) of sound in your ear. the volume (loudness) depends on how vigourously the hairs are moved by the sound wave. (thats why you can go deaf listening to loud music - you kill those little hairs if too loud). \n\nnotice i said sound!\n\nyour question is about electromagnetic waves. radio waves and visible light (green) waves are both of the same stuff (light energy - some we can see and some we cannot). the organ for detecting this energy is the eye. inside the eye, the retina (back of the eye) has special cells called rods and cones for detecting different wavelengths (i believe this is what your engineer was on about). each of these cells has a specific chemical for detecting a certain wavelength. lets pick on one.\n\nthe red light cone has a protein inside that has a special part that can move to a slightly higher energy form (a more awkward position for the proten so it wants to get back to where it was before - think of bending a ruler... the more you bend it, the more it wants to get back to where it was... so the higher the energy it has) when red light is shone on that protein (inside the eye) it provides enough energy to move this extra part of the protein (called an apoprotein portion is anyone wants to know) to a higher energy state and this is enough to induce (make happen) a signal being sent to the brain that says 'red light detected' and we see red light.\n\na similar thing happens to green light.\n\nin physics, when we talk of waves whether in music or lihgth or nanometers, if you have something of the same wavelength then it is detected as the same.\n\nif you have something of a different wavelngth then it is detect as different ( or in the case of the eye.. or even the ear, not detected at all, unless your are green, red or blue light)\n\nbut if you have a wavelength that is say  x2 bigger, of x3 or x6 or x2000 times bigger exactly, with no extra and no bits needed.. it has to be exact. then these also will be detected.. A BIT. we call thesse harmonics. this is a word that belongs to music.\n\never notice the way a piano has all those notes (only 8 notes and yet so many keys..?) these eight notes are repeated but in higher registers/keys, but they are still the same note.... a higher harmonic. all these wavelenths are doubled or trippled or what ever.\n\nso, because there will be a harmonic of green light in the radiowave part of the spectrum... it can theoretically be detected. so you could theoretically detect green light (with the eye) and radiowaves (theoretically with the eye)... but never with the ear :-)\n\nhappy days - now lets look at information theory! why do we always lose information and yet still maintain the integroty of the message? at what point is the message lost?
332552
we are from about 70 to 22000 Hz, we have one of the widest hearing ranges. So assume dears are somewhere in there. I think the harder question to answer is what is the sensitvity of their hearing in decibels
471190
Electromagnetic radiation in the 1 to 1000 m wavelength range.
43676
the wavelength is about 700 nanometers.
267763
The wavelength can be easily found from the formula C=F*L, where C is the speed, F is the frequency and L is the wavelenght. \n\nIn a vacuum, C=299792458 m / s, \n\nso L=C/(1Hz)=299792458 m , since 1 Hz= 1/s. \n\nIn other media, the speed C will be less, and the wavelength L will therefore be less.
817575
Velocity of sound  in air is relatively constant.\nAnd formula for the wavelength of sound is, lambda=v/f\n Whence, lambda, v, and f stand for wavelength, velocity of sound in air and frequency respectively.\nhere frequency is written in Hz\nIn view of the equation, as the frequency increases wave length decreases. Hence become short waves.\nOK, tymphanium membrane is a thin and delicate tissue. To cause vibration in the tissue wave should not be too long or short insted it should be within the specified range. \nWhen the wave becomes too short it passes through the membrane insted of causing vibration.\nThis is the cause for inaudibility of sound.