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

...

> From: Jet Black [mailto:tesla@...]

> A Black Body seems to be a theoretical device.

No more than a circle is a mathematical construct that happens to

approximate certain physical situations.

...> The often seen Ultraviolent Catastrophe in the various graphs

This is an odd way to look at it. Classical theory suggests a UV

> & texts seems to have some merit as it is based on

> "classical' theory" but lacks directions on how to avoid it.

catastrophe. Since there is no UVC, classical theory, or at least the

way it is used to approach this particular problem, must be flawed. QM

does not have this particular flaw. It's pretty simple that way. There

is no "merit" to a model of behavior that does not happen because it is

based on classical theory. I don't see why there should be?- At 04:46 PM 14/10/2004 -0700, you wrote:
>

So the difference between expressing & applying Pi as a 24/7 ratio vs

>Don't dis Pi. This is a valuable and venerable old number. Show a little

>respect."

>

> Do anything you want. Pi is pi and doesn't care a bit!!!!!

>

>Ed

3.14yadyyahyah_ is of little or no consequence when calculating stuff ?

You recently mentioned (or gave me the impression) that the difference

between

the speed of light in "air" vs the speed of light in vacuum is of no

real

consequence either.

Ed , as a credible Engineer & Educator, can I ask how or why you are

able to

dismiss the subtle differences in the values of each number or ratio

when used

for calculation purposes in the real world. ?

JB "

You must have misunderstood what I meant, or more probably I didn't

state it clearly. Pi is the name assigned to the ratio of the

circumference of a circle to its diameter and is irrational in any

number system you care to set up. That's what I meant by: "Do anything

you want. Pi is pi and doesn't care a bit!!!!!" As someone pointed

out, if you choose a system where the value of Pi is 1, all other values

will be irrational.

No intent to dismiss subtle differences in anything; not sure where you

got that idea. In radar work we have to correct for the subtle

differences in the velocity of propagation along the line of sight to a

target, based on the properties of the air along the way. There are

standard "correction approximations" which often suffice, but in order

to measure the range (and angle to, for that matter) with great

precision (+/- 5 ppm, for instance) it is necessary to use current

values for temperature, pressure, and humidity along the path. The GPS

has to worry about this and also ionospheric refraction as well.

For some practical problems 22/7 is a useful value for Pi, although

355/113 is very much closer. Turns out both values were known to the

(later dynasty) Egyptians, but they often used 3 as well. Pi also shows

up in just about any electrical engineering calculations and it's often

necessary to use at least 8 figure precision.

Ed