###### Asked in Atoms and Atomic Structure

Atoms and Atomic Structure

# Why are tau and muon leptons so rare?

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## Related Questions

###### Asked in Physics, Quantum Mechanics

### Why are leptons divided into families?

Leptons are divided into three families with 4 particles (2
particles, plus their two anti-particles) in each family. In the
electron family we have the electron, positron, electron neutrino
and electron anti-neutrino. Each family has a higher mass than the
one before it so the tauon is heavier than the muon which is
heavier than the electron. The physical reason for there being
three families is completely unknown and will probably win you a
Nobel prize if you can figure it out!

###### Asked in Math and Arithmetic, Mathematicians, Metric System

### Why Pi should be replaced with tau?

Pi (3.14) should be replaced with tau because angles are
measured easily in radians than in degrees. For an example, there
are 2Pi radians in a circle. 2Pi is equal to one tau (6.28).
Therefore, there are tau radians (360 degrees) in a circle. A
semicircle would have half tau (180 degrees) and a quarter of a
circle a quarter tau (90 degrees) and so forth.
P.S. - Pi is a constant which references the circumference of a
circle to its radius (2Pi radius; it will become tau radius).

###### Asked in Math and Arithmetic

### Do 36 and 48 have the same amount of factors?

A fun way to figure out the number of factors, other than
listing them all, is to use something called the TAU function. Take
a number, such as 36 and write it in its prime factorization So
36=32 x 22 and 48=24 x 3 Now Tau(36) (which we say as Tau of 36) is
the number of positive divisors of 36. Tau (48) is the number of
positive divisors of 48. We compute Tau by looking at the
exponents, 2 and 2 in the prime factorization and addiing 1 to each
then multiplying. Don't worry about the base, ONLY the exponents!
So Tau(36)=(2+1)(2+1)=9 Tau(48)=(4+1)(1+1)=10 which is greater than
9 so 48 has more factors. If you look at the links section with
this question, I provided a webpage that helps a little more!

###### Asked in Science, Physics, Particle Physics

### What are muons?

The muon (from the letter mu (μ)--used to represent it) is an
elementary particle with negative electric charge and a spin of
1/2. It has a mean lifetime of 2.2μs, longer than any other
unstable lepton, meson, or baryon except for the neutron. Together
with the electron, the tau, and the neutrinos, it is classified as
a lepton. Like all fundamental particles, the muon has an
antimatter partner of opposite charge but equal mass and spin: the
antimuon, also called a positive muon. Muons are denoted by
μ− and antimuons by μ+. For historical reasons, muons are sometimes
referred to as mu mesons, even though they are not classified as
mesons by modern particle physicists. Muons have a mass of 105.7
MeV/c2, which is 206.7 times the electron mass. Since their
interactions are very similar to those of the electron, a muon can
be thought of as a much heavier version of the electron. Due to
their greater mass, muons do not emit as much bremsstrahlung
radiation; consequently, they are highly penetrating, much more so
than electrons. Muons have a life of about 2 nanoseconds.