A question for a very-very well educated or smart person?

Question

i ve read somewhere that the "voice" a duck makes ( i dont know the word in english)
is the ONLY sound that doesnt have an echo
how is that possible????

Answer 1

A duck's quack doesn't echo" is a much quoted scientific myth. In spring 2003 it was quoted on Home Truths on BBC Radio 4 and Shooting Stars on BBC 2. You can listen to our sound files on Home Truths by going to the BBC4 web site and "listening again". Recently, Salford Acoustics was the source of the story being presented in the national and international media when we proved that a duck's quack does echo as part of the British Association Festival of Science.

Answer 2

The MadSci Network suggests an explanation for this common misconception. An echo is caused by sound waves reflecting off a hard surface. Higher frequency sounds reflect better and create stronger echoes. Perhaps some ducks have quacks without a lot of high frequency components, resulting in very faint echoes.

Physlink.com explains how an extremely clever duck might avoid creating an echo at all. If the distance between the duck and a reflective surface falls exactly at one of the nodes of the quack's sound wave, sound will not be reflected back, thus no echo. The duck could also use partially reflective material and some sound wave measurements to prevent a quack from echoing, much in the same way the military hides aircraft from radar. However, we suspect Daffy and his pals aren't quite that sophisticated or conniving.

Answer 3

Firstly you should not categorize people .This is wrong .No very well educated no very smart no very clever .Every human is same and can answer your question .Don't divide people into units.
I have just read the question and haven't heard question like this before.That s not possible for now I think but human invent new technologies so there may be some new technologies to make possible this one day may be some exists but I don't know .Duck voice is a voice too so the voice has an echo if there is a condition causing an echo . Like every sound it will have an echo too.

Answer 4

So a duck's quack does echo. Which leads to the most interesting question, why did the myth arise? The are a few possible explanations that I can think of:
The quack does echo, but it is usually too quiet to hear. When you want to hear an echo, you usually make a very loud noise to make sure the reflection can be heard. But a duck quacks too quietly, so the reflection is too quiet to hear. Ducks don't quack near reflecting surfaces. You need a large reflecting surface, a mountain or building for the sound to reflect off. Maybe ducks don't hang around reflecting surfaces.
It is hard to hear the echo of a sound which fades in and fades out.

Answer 5

A ducks voice does echo. That it doesn't is just an urban myth.

You can check it out at several websites such as snopes.com, university studies, and others.

Answer 6

I think this is a myth: I have read about that fact too, but I never read about an experiment confirming or denying it. So, I believe this is just a baseless and unproved statement.

Answer 7

What is the difference between a "very-very well educated person and a smart person" Loved the way you worded that!! LMAO

Answer 8

The quacking of ducks does cause an echo.

What is true, though, is that elephants can't jump :o)

Answer 9

It actually does have an echo, but the echo sounds just like the quack so you don't hear the echo.

Answer 10

Doesn't have an echo? I guess I'm not as smart as I thought, as I don;t know what that really means