Re: [Phys-L] decibels

[Anthony Lapinski <alapinski@pds.org>]

Neat!

Are there similar rooms/labs in the US open to the public or science
teachers?

On Wed, May 1, 2019 at 2:07 PM Chuck Britton <britton@ncssm.edu> wrote:

> Some decades ago I visited the Ontario Science Centre in Toronto and
> enjoyed walking through an anechoic tunnel.
> The lack of sound seemed to exert a PRESSURE on the ears! Very Strange
> experience.
>
>
> > On May 1, 2019, at 12:49 PM, Scott Orshan via Phys-l <
> phys-l@mail.phys-l.org> wrote:
> > Many years ago, I had the opportunity to visit the Bell Labs' anechoic
> chamber a few times. We used to go back there when we were in the building
> for lectures.
> > All six surfaces of the rectangular room were covered with absorptive
> wedges, so the "floor" is a taut metal wire grid. You are standing
> suspended above the floor, on this bouncy grid.
> >
> https://www.pbs.org/wgbh/nova/article/retroscience-in-the-sound-of-silence/
> >
> https://www.musictech.net/wp-content/uploads/2018/03/Beatie-Wolfe-in-the-anechoic-chamber-at-Bell-Labs-min-696x464.png
> > Message: 1
> > Date: Tue, 30 Apr 2019 11:23:56 -0500
> > From: brian whatcott <betwys1@sbcglobal.net>
> > To: phys-l@mail.phys-l.org
> > Subject: Re: [Phys-L] decibels
> > Message-ID: <a0a89d62-bd34-c36f-501c-d44e0a428f94@sbcglobal.net>
> > Content-Type: text/plain; charset=utf-8; format=flowed
> >
> > On 4/29/2019 6:20 PM, Anthony Lapinski wrote:
> > > A student sent me this short article about the world's quietest room:
> www.smithsonianmag.com/smart-news/earths-quietest-place-will-drive-you-crazy-in-45-minutes-180948160/
> > > Anyone ever been in a room like this?
> > >
> > > And what do negative decibels mean? The "threshhold of hearing" (10^-12
> W/m2)
> > > corresponds to 0 dB. So a sound quieter than this (say, - 20 dB) has an
> > > even lower intensity (10^-14 W/m2)? Is there a lower limit?
> > >
> > > How does this work with volume control knobs on stereo systems?
> >
> > _______________________________________________
> > Forum for Physics Educators
> > Phys-l@mail.phys-l.org
> > http://www.phys-l.org/mailman/listinfo/phys-l
>
> _______________________________________________
> Forum for Physics Educators
> Phys-l@mail.phys-l.org
> http://www.phys-l.org/mailman/listinfo/phys-l

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