Aren't phonons the storage of momentum/sound at the atomic or crystal lattice level? And wouldn't they be more or less in-phase when a bulk object resonates at that internal frequency? I suspect that a "singing stone" which has a resonant frequency *not* dictated by the cut size of the stone is just such an animal - a sort of sound laser. I suspect that the acoustic output is ordinary and isn't any more beam-like than any sound at that frequency (legends of acoustic stone levitation not withstanding). It might be called an AASER - acoustic amplification (by) stimulated emission (of phonon) radiation. Needs a better acronym, though.
-----Original Message----- From: Robin van Spaandonk [mailto:[EMAIL PROTECTED] Sent: Monday, November 28, 2005 11:06 AM To: [email protected] Subject: Re: Maser In reply to leaking pen's message of Mon, 28 Nov 2005 12:51:32 -0700: Hi, [snip] >no, its a beam of em radiation in the microwave band similar to a >laser. You missed the "of sound" bit. AFAIK there is no such thing for sound, because there is no way of storing sound energy at the atomic level, hence no inverted populations can be created, and therefore no stimulated emission is possible. > >On 11/28/05, thomas malloy <[EMAIL PROTECTED]> wrote: >> >> Is a maser a beam of sound similar to al laser? >> >> >> --- http://USFamily.Net/dialup.html - $8.25/mo! -- >> http://www.usfamily.net/dsl.html - $19.99/mo! --- >> >> Regards, Robin van Spaandonk http://users.bigpond.net.au/rvanspaa/ Competition provides the motivation, Cooperation provides the means.
