Re: [LAD] Audio Levitation

On Fri, Jan 03, 2014 at 08:02:17PM +0100, Arnold Krille wrote:
> On Fri, 3 Jan 2014 16:00:16 +0000 Fons Adriaensen <fons@email-addr-hidden>
> wrote:
> > BTW, 120 db SPL is also around 1 W / m^2, so harvesting energy from
> > sound panels (similar to solar panels) is another idea that won't
> > go far.
>
> I like your wording here:-)

Purely accidental - 'pun not intended'.

> Especially considering the fact that sound
> distributes spherical. So the energy looses in r^3... afair.

No, sound power (for a point source) goes down as the square
of distance. It's power / surface and the surface of a sphere
is 4 * pi * r^2.

Ciao,

-- 
FA
A world of exhaustive, reliable metadata would be an utopia.
It's also a pipe-dream, founded on self-delusion, nerd hubris
and hysterically inflated market opportunities. (Cory Doctorow)
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