WOOOOOOOOOSH!!!

I knew someone wouldn't get it>> ^mxxcon:

>> ^aspartam:
Ummmmh, okay....? I bet next thing you'll tell me is that you can bend a light beam?????!?!?!?

perhaps you'd like to check out http://www.kids-science-experiments.com/bendinglightinthedark.html

>> ^aspartam:

Ummmmh, okay....? I bet next thing you'll tell me is that you can bend a light beam?????!?!?!?

perhaps you'd like to check out http://www.kids-science-experiments.com/bendinglightinthedark.html

Ummmmh, okay....? I bet next thing you'll tell me is that you can bend a light beam?????!?!?!?

In all seriousness,

"The concert was held at Foro Sol stadium, a baseball stadium with a distance of 125m from home plate to the centre field wall.

I counted 14 waves in 10 seconds, with about 0.3s between waves, so about 0.41 seconds for a wave to travel the length of the field. Speed of the wave is therefore 305m/s. The speed of sound in air at 2240m is actually 343m/s... so... it's sorta close."

>> ^spaceman:

First, sound waves do not "expand" and second they travel at ~343 at sea level in our particular atmosphere/medium.

First, sound waves do not "expand" and second they travel at ~343 at sea level in our particular atmosphere/medium.

The sound wave one was misleading since it was aimed upwards, you have the force of gravity slowing down the projectile paint.

Well done though...

rough calc of explosion til sound wave puts this fellow about 3/4 a mile from the explosion....YIKES!

>> ^rgroom1:
how about that's not how sound waves propegate?
That is art, not science.


Yeah, I would like to know what's generating the z coordinate here - is it a pretty pattern algorithm or some other property of the recorded sound.. reverb or something?

how about that's not how sound waves propegate?

That is art, not science.

probably something similiar to software used to render physically accurate light reflections and refractions in graphics software, coupled with assigning the 'photons'(sound waves) a speed at which they propagate rather than instantaneous projection
probably relatively useless at the moment but interesting nonetheless

Screw reporting, scientist should be using her to test sound waves

^ The whale was named after the milky-white waxy substance, spermaceti, found in its head and originally mistaken for sperm or semen. -wiki

Scientists still do not know the precise purpose of the spermaceti organ. It is believed that it controls the whale's bouyancy, to assist it in diving and ascending. It is also possible that the organ is used to amplify and direct the sound waves, that the whale uses for echolocation. -random website

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While we're being super technical, I might add that this is not an example of "actually see[ing] the sound waves." Rather, this is merely the secondary effects of the sound wave.

Interesting nevertheless.

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^Are you a sound engineer? If so, maybe you should read John Huntington's blog and learn a few things. Here's what he had to say:

"And so, when we have a sound system where we want people to hear some distance away from the stage, sound system engineers have to take this into account. Speakers at a distance from the stage (like at the concert pictured in the video) must be intentionally delayed to get them to line up in time with the sound emanating from the stage. This happens because the electrons in the cables transfer the audio signal out to the delay speaker positions effectively, for our purposes, "instantly", while the sound waves, vibrating air molecules, can take many seconds to travel. And if the "delay" speakers, remote from the stage, are not aligned in time (even milliseconds matter), the audience will hear either destructive interference called "comb filtering", or perceive an echo. (Interestingly, from what I saw on screen, it appears that the large video displays on the mall were actually delayed to match the slowness of the sound.)"

adn here are some of the comments on the thread. (some of these are really cool)

-"Very cool way to show this "lag".

To geek you out further. Since heat rises, many sports arenas can have a 10degree or greater temperature difference from floor to ceiling during a show. Sound traveling through the top of the room to the balcony's gets to the last row before the sound on the floor.

This is not a constant. During sound check the room is much more balanced. But put 5,000 excited dancing people in the room. Now try and calculate your delays."

and

-"I know the effect well. When I mixed sound for outdoor rock festivals and they'd often times have the mixing booth a 200 - 300' from the stage.
I'd always have to slip the headphones on and mix that way when timing was critical. It was the only way you could time changes properly.

Most sound engineers didn't know this trick and they would always screw up the timing and couldn't figure out why.
The same engineers used to criticize my use of the headphones as they said you have to mix for the audience not for the headphones.
Well you can't mix for the audience if you have a 1/4 second time delay."