true or false?

depends which way its going on the conveyor belt.

False, iirc it's not audible to humans or something like that. Why would it not echo?

it would if you put it through an effects unit

Drac – Member
False, iirc it's not audible to humans or something like that. Why would it not echo?

Why would the echo be inaudible to humans ❓

Why does a duck?

Why would the echo be inaudible to humans

You do know hearing is limited. It's something to do with the waveform not the same way as pitch like on a dog whistle though.

Surely it does echo as it's just a sound wave? Unless it has so little energy that it gets absorbed by the reflective surface…but that would differ dependant on material so doesn't seem likely to me.

here's a link:

do you not know how to use google?

edit, summary:

The are a few possible explanations:

* 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.

edit:

bloody linky rubbish hyphon slash colon url backslashtyping not very good at thiswannagohome and watch the tourontellly.

Thank the Lord it has been thoroughly researched by a top UK acoutics dept (I can't believe I am typing this)

duck tested in anechoic chamber

click link for bizarre pictures (unable to link to them 🙁 )

http://www.acoustics.salford.ac.uk/acoustics_info/duck/

awhiles – I do, I just thought this was more fun. Do you know how to link? 😉

Quite right chvck – the sound wave just bounces and so there's no reason why the frequency would change.

Brilliant!

It always saddens me slightly when this bizarre myth is de-bunked. Of course a duck's quack echoes, but the universe would be a slightly more interesting place if it didn't. 😀

GrahamS how? It appeared not to be web-hosted to me from the source.

And dogs can't look up, either.

Thank the Lord it has been thoroughly researched by a top UK acoutics dept (I can't believe I am typing this)

The reason it's been studied is that one of the profs of acoustics at salford (Trevor Cox) is an EPSRC media fellow.
ie. The government pays him to present science to the public thorough mainstream media. This typically needs to be something the public + media are interested in.

The MP3 of the reverberant duck is awesome.

Daisy was kindly lent to us by Stockley Farm in Cheshire; this is a working farm open to public. Unfortunately, Daisy has been eaten by a fox

🙁

GrahamS how? It appeared not to be web-hosted to me from the source.

<geek mode>

If it appears on a web page then it must be "web-hosted" (unless you happen to be on the same PC as the web page).

The source says <img src="media/duck_santa_hat_med.jpg" ...

That is a relative address, starting from the address of the current page, which is http://www.acoustics.salford.ac.uk/acoustics_info/duck/
so the absolute address of the image is http://www.acoustics.salford.ac.uk/acoustics_info/duck/media/duck_santa_hat_med.jpg

See http://en.wikipedia.org/wiki/Url#Absolute_vs_relative_URLs for more info.

Having said that, all I actually did was right-click on the image (in Firefox) , choose "Copy Image Location" then paste it in here. 🙂

</geek mode>

/cool. Thought it might be something like that. Frikkin IE!

Stockley Farm in Cheshire; this is a working farm open to public.

I'm always intrigued when I see the sign for this place – why would anyone advertise the idea of a working farm?

Is it so the townie plebs can be convinced that life continues in the countryside, even when they turn their backs?

FFS

You've put too much thought into that Ourman, it simple means it's not a exhibition type farm but a farm that is still a farm where you can visit.

Not far from me there is a sign to White Post Modern Farm… for ages I used to wonder what a post modern farm would be like, especially a groovy white one…

It was only a while ago that it dawned on me that it could actually be 'White Post' Modern Farm… as it is, it turns out to be a farm park type place for kids to go and stroke animals…

wat

Also it is aerodynamically impossible for bumblebees to fly. FACT!

Now how about the research about which way water goes down the plughole in the southern hemisphere?

someone should collect all this sort of stuff & shove it on the internet somewhere

Unfortunately, Daisy has been eaten by a fox

No more quacking or echoing for Daisy now!

depends which way its going on the conveyor belt.

If the conveyor belt was going quick enough, would the duck cause a sonic boom? 😆

Chickens cant walk backwards. Fact.