Natural Science Forum / Physics / Research / July 2007

This is, essentially, a followup to
2001 May 30
http://groups.google.com/group/sci.physics.research/msg/57fde0ce6f2aaab8?dmode=source
Detail is in the following

In January 2007, markwh04@yahoo.com wrote:

I (Marc Nardmann) replied:

Simple question.
Think of hydrogen gas absorbtion spectral lines. The spectum of the
hydrogen atom is a truly discrete list of precise numbers. It seems
that a hydrogen atom can only absorb a photon of precisely one of  a

I'm working on a research topic that involves detection of secondary
electrons induced by energetic ions. Secondary electron emission may
originate from the substrate from which ions emerge, or ions may be forced
to pass through a thin carbon foil (thin enough not to generate too ...

Dear friends:
I have posted a single-page, six-line, calculation based on Gaussian
integrals, at the link below
http://home.nycap.rr.com/jry/Papers/Gaussian%20Integrals.pdf

If one throws a pebble into a pond, a concentric sequence of circular
waves are formed. The spacing of the concentric waves looks even, so
that as a first guess the ripple spectrum has a narrow bandwidth.
However, I don't understand why this would be true since there was no

I've been trying to digest Rovelli's work on what he calls
"relativistic mechanics", essentially a generalised classical
mechanics, treating time on the same footing as any other variable. As
I understand it, the geometric structure works as follows:

Hi, I'm not getting enough response elsewhere:
What is the electric field near a rotating wire section rotating like a
baton? (Let's say, close to the relevant side and axis of a slowly rotating
rectangular current loop.)  I am wondering why the use of some valid field

Say we find a higgs boson using the CERN particle accelerator. What
would happen next?

How do I calculate the noise spectrum (a in 1/f^a) for a waterfall as
a rough estimate? This is not a homework problem, and I wasn't given
it so it may be more vague or worded differently than expected.
Thanks,

Thermal radiation and optical opacity
The (apparently) prevailing belief at sci.astro.research, that matter
cannot radiate heat unless it is optically opaque at the appropriate
EM frequencies, has led me to ponder whether this is true or not, and

I am wondering about the extent to which the generation of
gravitational waves is dependent upon the assumption that 4d spacetime
is locally Lorentz invariant on very small scales.  Put another way,
if spacetime were not asymptotically flat, or nearly so, would that

I've been taking part in a long thread on the online Physics Forums
regarding a relativistic treatment of a spinning elastic hoop (or maybe
"loop" is a better word, because we're assuming an essentially
1-dimensional object with no resistance to bending).

I read that a planet's gravity field extends to infinity. Is this true
and if so how do we know? What would the Earth's effect be on another
planet say a couple million light years away?
Thank you in advance.

17-JUL-2007
Could someone help me understand why the interior of a black hole is a
"hidden region," according to Lee Smolin's explanation in "Three Roads
to Quantum Gravity," while the region "outside" the universe is NOT a