**Date:** Fri, 02 Mar 2012 17:20:04

**Author:** ---

**Subject:** Re: What "Math" Demos among the Physics Demos Do You Like?

**Post:**

You're right, I overlooked that. Replotting the results though

helped me to realize why this does not seem like a random

process. Flipping a coin or rolling dice are more familiar examples of

random processes. All outcomes are equally likely, so a plot of the

outcomes would be essentially a flat line. The time interval plot is

exponential. The article says that is expected but does not explain why...

Jerry

D

At 3/2/2012 09:59 AM, you wrote:

>Hi Jerry. The first number was *one* time bin... 0 to 1 us. The rest

>were the sum of twenty bins... 1us to 20 us, 21 us to 40 us.... Etc.

>

>George H.

>

>(I've been away at the APS show.)

>

> > -----Original Message-----

> > The meaning of the 2nd to last sentence is a little

> > difficult to understand. But if it is the case that the

> > shortest time is the most likely, then the data does not show

> > that by a long shot. The shortest time interval had only 12

> > counts, with a possibility of only a few more. Well below

> > the count in the next interval...

> >

> > Jerry D

> >

> > At 2/24/2012 07:54 AM, you wrote:

> > >The way I describe the physics of decay is that the

> > >decay is governed by a fixed probability per unit

> > >time that any particle will decay. It also applies to

> > >the time to the next pulse of any Poisson process.

> > >If the probability per unit time for decay or for some

> > >other Poisson event to happen is 10^3 per second, the mean

> > >lifetime or mean time to the next event is 1 ms.

> > >The probability of decay in the first microsecond

> > >would be approximately 10^-3 and if it hasn't decayed by then

> > >the probability would be the same for decay in the second

> > >microsecond, but the overall probability for it to happen in

> > >that second microsecond is 0.999 times smaller as that would be the

> > >probability it survives the first microsecond.

> > >Hence the shortest time is the most likely.

> > >

> > >Regards,

> > >Bob

> >