Ole,
For a two-sentence summary, I think the wine glass example of Q works
fine. The audience typically knows about bells ringing and wine glasses
singing, so this factoid resonates with them. But the issue is then:
what's the point; why is a long bright ring better than a short dull
plink. That's where it gets hard.
For a deeper look, I keep a list of articles about Q here:
http://leapsecond.com/pages/Q/
Of those, I would recommend reading at least this one all-time classic
note from Bell Labs:
http://leapsecond.com/pages/Q/1955-The-Story-of-Q-Green.pdf
It's relevant to from quartz and atomic clocks, from wine to earth rotation.
/tvb
On 1/26/2021 4:28 AM, Ole Petter Ronningen wrote:
Hi, All
I am going to give a presentation to non-nuts, and in one of the slides I
touch on Q - not wanting to spend more than a sentence or two on the
subject, I wonder if the following analogy works:
"A quality long-stemmed, thin-walled wine glass will ring for a long time
after we give it a little tap - this is high Q. A thick-walled, stubby milk
glass will barely ring at all, just a dull "plink" - this is low Q. The
energy we put in dies out very quickly."
As I am sure is embarrassingly evident, I have a rather tentative grip on
the subject myself..
Ole
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