[Phys-L] decibels

[Anthony Lapinski <alapinski@pds.org>]

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?

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