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Message: 1
Date: Sun, 19 Apr 2009 16:59:05 -0400
From: ludwik kowalski <kowalskil@mail.montclair.edu>
Subject: [Phys-l] Watch "60 minutes" today
To: Forum for Physics Educators <phys-l@carnot.physics.buffalo.edu>
Message-ID: <19501B3A-5B85-45E9-A5E8-F35A7BF90610@mail.montclair.edu>
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According to:
http://superwavefusion.com/media/press-releases/
"Landmark broadcast airing Sunday, April 19, 2009 at 7pm EST, CBS News
Magazine, ?60 Minutes?, profiles the breakthrough research . . .
- - - - - - - - - - - - - -
Ludwik Kowalski, a retired physics teacher and an amateur journalist. Updated links to publications and reviews are at:
http://csam.montclair.edu/~kowalski/cf/ http://csam.montclair.edu/~kowalski/my_opeds.html http://csam.montclair.edu/~kowalski/revcom.html
Also an essay on economics at: http://csam.montclair.edu/~kowalski/economy/essay9.html
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Message: 2
Date: Sun, 19 Apr 2009 22:10:40 -0700
From: Bernard Cleyet <bernardcleyet@redshift.com>
Subject: Re: [Phys-l] Watch "60 minutes" today
To: Forum for Physics Educators <phys-l@carnot.physics.buffalo.edu>
Cc: Nancy Seese <nancyseese@redshift.com>
Message-ID: <68C2448D-CEAF-47B5-BAB3-FE01AF0DB2D0@redshift.com>
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I recorde3d it and listened to some of it -- Die Panzer.
bc
On 2009, Apr 19, , at 13:59, ludwik kowalski wrote:
According to:
http://superwavefusion.com/media/press-releases/
"Landmark broadcast airing Sunday, April 19, 2009 at 7pm EST, CBS News
Magazine, ?60 Minutes?, profiles the breakthrough research . . .
cut
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Message: 3
Date: Mon, 20 Apr 2009 00:46:36 -0500 (CDT)
From: Jack Uretsky <jlu@hep.anl.gov>
Subject: Re: [Phys-l] models of radioactivity
To: Forum for Physics Educators <phys-l@carnot.physics.buffalo.edu>
Message-ID: <Pine.LNX.4.64.0904200040310.19520@theory.hep.anl.gov>
Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed
The time dependence of a population of decaying atoms is assumed to follow the Poisson law
N(t) =N(0)e^{-pt).
the half-lkife T' is defined to follow N(T') =N(0)/2, or
e^{-pT'} =1/2
Taking the ln of each side of the last equation gives:
pT' =ln2, which leads immediately to the quoted equation.
On Sat, 18 Apr 2009, Brian Whatcott wrote:
John Denker wrote:
On 04/17/2009 10:25 PM, Hugh Haskell wrote:We?
we know that half-life (T) can beWhat do you mean by "we", Kemosabe?
expressed as
T = (ln 2)/p (1)
The folks at MIT giving an introduction to modeling radio-active
half-life, for example.
See this version
<http://www-math.mit.edu/~djk/calculus_beginners/chapter12/section02.html>
Hugh is in fact illustrating a comparable example to the difference
between compounding capital at time intervals, say weekly, monthly,
quarterly etc., and
compounding capital continuously. This is a standard introductory
element of
teaching exponential versus discrete time models, I thought?
Brian W
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