The range of human hearing is roughly from twenty hertz to twenty kilohertz. Based on these limits and a value of 300 m/s for the speed of sound, what are the lengths of the longest and shortest pipes (open at both ends and producing sound at their fundamental frequencies) that you expect to find in a pipe organ?\n m (shortest pipe)\n m (longest pipe)
137299
f1=20h\nf2=20000h\nv.sound=300m/s\nwavelength wil be represented by "LL"\n\nLL1=v.sound/f1\nLL2=v.sound/f2\n\nLL1/2=length of pipe 1=7.5m\nLL2/2=length of pipe 2= 7.5x10-3m
437644
how long is  apeice of string???\nwouldnt it be good to see what is lurking at the bottom of the sea. could be a whole new world!! (well you never know!)
185128
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
28654
Wave length is often represented by the Greek lower case letter lambda (your stick figure).  Replace that in your equation with "wavelength" or W until it makes sense then substitute lambda back into the equation.  It is just a shorthand notation that scientists have agreed upon (and nothing very magic).  See the link for more.  Good luck.
86688
How long is a piece of string ? Twice the distance from the centre to one end !
187598
One up and other down with no crest in between implies, 'half wavelength is 4 m'.Therefore in 3 second distance travelled by the wave is 8m. Velocity is  Distance by time = 2.66 m/s.
637306
Sound travel in air with a speed of 331.4 m/s. For sound to travel from the student to the wall and back it must travel 165*2=330 m.  For sound to travel 330 m , it will take approximately 330/331.4=..9958s.
240076
Another person had the same basic question. This is called the Doppler Effect, which follows the equation:\nf = f0 [(S +/- So)/(S -/+ Ss)]\nWhere f is the observed frequency, f0 is the frequency of the source, S is the speed of sound, So is the speed of the observer (+ if moving towards, - if away), and Ss is the speed of the source (- if moving towards, + if away).\nIn this case, just set f = 1.05f0
622309
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.
341955
Assume microwaves travel at the speed of light...\n\nv = 300,000,000 m/s\nwavelength(lambda) = 16 cm = .16 m\n\nFrequency = v/lambda\n\nFreq. = 300,000,000/.16\n\nFreq. = 1.875E9 Hz... or 1.875 GHz
498813
"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.
647469
Mach is speed of sound, so M3 is ~2200 mph.\n\nYou could hear your voice because we hear our own vioce partially through internal resonance, which would not be affected by external velocity.
63321
The extremes that people can hear are 20 Hz to 20 kHz.  The upper limit for most people is closer to 15 kHz.  For comparison, 60 Hz is the low-pitched hum you frequently hear from AC wall power.  320 Hz is middle C.  440 Hz is the "A"that you hear when an orchestra is tuning.  Each octave is double.  So, high "C" is 640 Hz and the "A" above is 880.  Two octaves above middle "C" is 1280 Hz, and so on. Many, though more females than males, can detect a high pitched noise from the scan rate of the TV video.  This, is at 15.734 kHz.\n\nA and B are on the order of the vibrations you might feel from an earthquake -- more felt than heard.  100 kHz is well beyond the range of human hearing.  Dogs don't even hear that high!  That leaves "C" as the correct answer.
481394
Sound travels at different speeds depending on what it is traveling through. Of the three mediums (gas, liquid, and solid) sound waves travel the slowest through gases, faster through liquids, and fastest through solids. Temperature also affects the speed of sound. \nGases: \n\nThe speed of sound depends upon the properties of the medium it is passing through. When we look at the properties of a gas, we see that only when molecules collide with each other can the condensations and rarefactions of a sound wave move about. So, it makes sense that the speed of sound has the same order of magnitude as the average molecular speed between collisions. In a gas, it is particularly important to know the temperature. This is because at lower temperatures, molecules collide more often, giving the sound wave more chances to move around rapidly. At freezing (0º Celcius), sound travels through air at 331 meters per second (about 740 mph). But, at 20ºC, room temperature, sound travels at 343 meters per second (767 mph). \n\nLiquids: \n\nSound travels faster in liquids than in gases because molecules are more tightly packed. In fresh water, sound waves travel at 1,482 meters per second (about 3,315 mph). That's well over 4 times faster than in air! Several ocean-dwelling animals rely upon sound waves to communicate with other animals and to locate food and obstacles. The reason that they are able to effectively use this method of communication over long distances is that sound travels so much faster in water.\n\nSolids: \n\nSound travels fastest through solids. This is because molecules in a solid medium are much closer together than those in a liquid or gas, allowing sound waves to travel more quickly through it. In fact, sound waves travel over 17 times faster through steel than through air. The exact speed of sound in steel is 5,960 meters per second (13,332 mph)! But, this is only for the majority of solids. The speed of sound in all solids are not faster than in all liquids
403787
20Hz- 20kHz (audible frequencies)\n< 20Hz (infrasonic)\n> 20kHz (ultrasonic)\n\nlongitudinal wave - sound wave\nthe rest are transverse waves
597683
human beings are able to perceive sounds between 20 and 20000 hertz.the sounds having frequencies above the 20 kilo hertz mark are termed as ultra sonic sounds. And for futher information the sounds having frequencies below 20 hertz are termed as infrasonics. though all this may vary from animals to humans and in humans too because of the different biological formations. BY THIS VARIATION I MEAN THE VALUE OF THE PERCEIVENCE OF SOUNDS FREQUENCY MAY VARY.
671634
The velocity of sound in air or the frequency of a tuning fork is determined using the principle of resonance of air column.\n\nIn that experiment the length of air column is adjusted and the tuning fork is used to vibrate the air column; the water or glass is not vibrating so much and can be considered as having no vibration at all. \n\nWhen the frequency of tuning fork is high the resonating length of air column is less.\n\nHere in your case, the water and hence the glass are vibrating, and sound is passed through the air. No stationary sound wave is formed above the water level.\n\nThis is a case of forced vibration and the vibration frequency depends only upon the vibration of water particles, the glass vibrates with the frequency of the water particles; the glass is not left free to vibrate with its natural frequency.\n\nIf you have water to some level in the glass and strike the glass with some hammer and leave it to vibrate then only the glass will vibrate with its natural frequency.