jcon wrote in sci.physics.relativity:
Pentcho Valev wrote:
http://abyss.uoregon.edu/~js/glossary/cosmic_rays.html
"Some secondary muons have such high energies that they are able to
penetrate the Earth to depths of more than 3.2 km (2 miles)."

http://www.physics.ox.ac.uk/Neutrino...ome%20Page.htm
"The energy loss of a muon in the atmosphere is about 2 GeV and
therefore the muons which contribute to the low energy neutrino flux do
not reach the ground."

Relativists' confessions (on sci.physics.relativity):
"Yes indeed: a low energy muon incident on the top of the earth's
atmosphere will lose energy quickly due to interactions with the air,
will penetrate the atmosphere only a small distance, and will live only
a short time. A high energy muon will lose some of its energy due to
interactions with the air, but will still have a considerable energy
when it reaches the ground, and it will penetrate the ground (perhaps
several kilometers); on average it will live a much longer time than
the low energy muon. Yes, the low energy muon had a shorter "lifetime"
than the high energy muon (both measured by an observer at rest wrt the
earth). Yes, this is NOT due to time dilation."


This is somewhere between badly worded and just
plain wrong wrong. The writer seems to be mixing up
the notions of muon path length and muon lifetime.

So the writer Tom Roberts, the self-appointed relativity hypnotist on
sci.physics.relativity, will be kicked out. Nobody in Einstein's
criminal cult is allowed to pronounce anything which is "plain wrong
wrong" and to mix up "the notions of muon path length and muon
lifetime". Unless the cult gets rid of Tom Roberts and other dangerous
individuals, the world may get rid of the cult.

Pentcho Valev