Why doesn't a duck's quack have an echo?
464324
This is a myth of almost Urban Legend type of status (except not enough people "care" about this myth to give it that type of status).\n\nIt has been proven, and you can even hear the proof yourself.
345735
If everyone in the world was deaf, and the tree fell, it would still make a sound, but we just can't hear. \n\nA dog can hear things humans can't, but it doesn't mean those sounds don't exist.
685422
I don't really know, but I wanted to tell you that this is my favorite all-time question on this site.\n\nI WISH I knew how to rudder-fy a duck--I'd really love to help you out with this one.\n\nI do have a question though--if the duck didn't swim in circles (or at least ovals) wouldn't the duck crash into the side of the tub?\n\nThanks for posting this this morning.
358878
I understand its a ducks 'quack' although ive never been in a position to prove this
741475
Good question.\nNo. If you are travelling faster than the speed of sound (faster than Mach 1), you can not hear an echo of the sounds that you make.\n\nIn order to hear an echo, the sound must travel from your location, bounce off something, and return to you. \n\nIf you are travelling faster than Mach 1, all of the sound that you make is behind you. Whether it bounces or not, it can not come back to you, because once it's behind you it can't catch up with you.\n\nHere's an interesting thought: \nIf you subsequently slow down to less than Mach 1, then the sounds that you made while travelling faster than Mach 1 will start catching up with you. When you hear those sounds, they will not be echos in the sense of "sound that BOUNCED back to you." But you would experience the same effect as an echo (a sound that emanated from you, and later reached your ears).
393383
Yes - it still sounds like a quack, but it's very loud, fast and much, much shorter.
158113
It's one of those, "if it looks like a duck, walks like a duck, quacks like a duck, and dies like a duck, it must be a duck!"
221191
i agree.  sound waves are comparable to waves in a fluid, like water.  A good way to test the reflectivity of a material would be to see how strongly water ripples would bounce off of a wall made of that material.  If you picture disturbing water near a submerged marble wall, you could imagine that the waves would bounce off quite neatly compared to how water may reflect waves from a styrofoam wall or a rough, jagged rock surface.  So, bottom line, dense smooth surfaces produce the best echo.
8413
Because it was designed to seal air ducts...I imagine that when pronouncing it, people got lazy and began leaving off the 't' sound, until it sounded like "duck"...and then someone in marketing decided to use it. Now some brands actually are called "duck" tape.
298985
Yeah, the sound in the shell is the echo of the blood flow. The only way I know of to hear the ocean from far away is a recording.
1046148
For the same reason Goofy (a dog) CAN talk and pluto (also a dog) can't!!!\n\n\n\nIT'S PRETEND!!!!!!
410512
maybe their HORNS doesn't work..lol\n\nringing BELLS, ringing BElls.. mad cow layed a pooh..lolmao!:)
72994
If it looks like a duck and quacks like a duck, it probably is a duck.\n\nIt's a scam.
100811
Is that the echo...echo..echo....???\n\nDepends what exact language you weant to learn.\nI have some software from  www.byki.com
257535
It does echo. Mythbusters (the TV show) debunked the myth. Using a bunch of expensive studio equipment, they found that yes, it does echo, but the quack closely resembles the echo, enveloping it.
46211
Of course it does. Sound waves are generated, and just because there is no one to hear does not they don't exist.\n\nIf a bear poops in the woods and no one is there to smell it, does it still stink?
913127
not i said the duck...