Why doesn't the duck's quacking generate echoes?
409841
They did this on mythbusters, episode 8.   I can't exactly remember why you can't hear it, but it does echo.  I think the echo came back so fast, you still heard it when you were hearing the origonal quack.
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.
692330
The reason why you hear an echo is because of the reflection of sound. Objects which have smooth surfaces such as walls, floorboards, etc. reflect alot of the sound energy which hits it.\n\nObjects which are more irregular, i.e. have rough surfaces, such as carperts, rugs, lounges, etc. will absorb more of the sound than it reflects.\n\nAlso an absence of any objects within the home could also cause sound to echo, as there are no objects in which the sound waves may be absorbed by. From this it is even possible to have multiple echos as the sound is continually reflected (but probably wont be expreienced within small homes).
818190
try messing with the controls under sound properties in control panel ..
563037
If it walks like a duck, talks like a duck, it must be a duck!
564107
I just want to add a note about ultrasound for pest control. You need to make sure you get a sophisticated unit that sweeps the frequency ranges and randomizes the outputs to prevent "notch" deafness. \n\nThe problem with ultrasound is the effects are only temporary.  The pests will move out of the area temporarily, then begin to approach the source of the ultrasound over time.  The very specific cells in the cochlea that react to the ultrasound will die, but the cells that decode other sound frequencies will be unaffected, so in time you will have a bunch of "notch deaf" birds back roosting on the lines.  \n\nWith the ease of adding a microprocessor to practically any electronic product these days, notch deafness has been addressed.  See the website. \n\nA bird hotel may be the only option for such a wide open space--putting sound out in the open may have limited effectiveness, such as on a power pole.
160063
cause all chickens do is duck there heads down\n    duh
888903
Bats or rats; better find out.\n\nPS Clicking is how their radar works, but we are speaking of vocalizations, not radar ( echolocation, to be precise ), and bats do vocalize.
619160
Check your sound drivers.  If they're out of date, update them.\n\nIf they're okay, change the audio setting in the game.  If this doesn't resolve the issue, then it might be that the game doesn't properly support your sound card.  Check with the game manufacturer's website for technical support regarding the game.
329373
Well yeah it does, just cause no one's around to hear it doesnt mean the tree doesnt make a sound! I bet ya the squirrels and the deer can hear it...
328283
I bet I have seen more platypus than the lot of you put together and i have never heard any noise apart from the gentle splash as they duck (no pun intended) beneath the surface. However, if you were to be stung by a male platypus in the breeding season you would make a LOT of noise. They are the most venomous mammals in the world.
387840
if your using windoves media player the wow setting could be set to echo
934007
I ask the person or people near by if they heard ducks quacking?!!!\nLOL
306289
It still sends sound waves through the air, yes.  It does not, however, make noise.  Because noise is defined as something we hear, and obviously no one can hear it.  I know, I have a lot of time on my hands to come up with answers.
1056075
it does make sound!!!!........ how stupid iz that \nWt a question >>>>> so weird !!!
898775
Sometimes during the MP3 compression process, small rodents get into the bit stream.  When this happens, you get a sort of squeaky noise.  Most often the rodent is a chipmunk but sometimes you'll hear a squirrel or a rat squeak during playback.  If this happens, simply repeat the compression process.  OK, that's not true, scratches on the CD are most likely the cause or bad compression software.  Or mabye it's not.  How do I know?  I'm just one person.
26412
If you go to your sound options, there should be a option for testing.  If not, if you go to the volume control, and click on the main slide, windows will play a quick sound. This will also work if you bring up the small slider from the volume icon in the taskbar.