Tuesday, March 29, 2011

Muons, Pions and Eminem

The Muon Decay Experiment

What you need to know about Muons:

Muons are leptons - a type of subatomic particle. They are created created in the atmosphere, 10 km from the surface of the Earth. The cosmic rays from the sun hit the atmosphere and can create muons that travel up to 0.99c.
Muons have an average lifetime of 2.2 x 10-6 seconds. This is measured in the frame of reference of the muon (so it is proper time)

So the maximum distance a muon can travel is 2.2 x 10-6 x 3 x 108 = 660m


Awwwww, isn't it cute?

The thing is, eventhough the muons are not supposed to reach anywhere near Earth, we are still able to detect them. (using the cute-o-meter...joke)

So, remember that anything moving at the speed of light (in this case it s 0.99c) will experience the effects of special relativity.

A muon moving at 0.99c has a Lorentz factor of 7.1.

In terms of time dilation:

From the muon's frame of reference: the muon measures proper time. 2.2 x 10-6 seconds.

From the Earth observer's frame of reference: the muons move towards the stationary observers at 0.99c and is thus time dilated to 7.1 x 2.2 x 10-6 seconds = 1.562 x 10-7 seconds

Remember that time dilation is concered with longer time periods while length contraction is concerned with shorter distances.

 In terms of length contraction:

From the muon's frame of reference: everything around the muon will now appear shorter (but not the muon - imagine sitting on the muon like a train, everything on the train stays the same) due to length contraction by a factor of 7.1.





1 comment:

  1. I would highly recommend Mr Benjamin services to any person in need of financial help and they will keep you on top of high directories for any further needs. Once again I commend yourself and your staff for extraordinary service and customer service, as this is a great asset to your company and a pleasant experience to customers such as myself. Wishing you all the best for the future.Mr, Benjamin is the best way to get an easy loan,here is their email..  247officedept@gmail.com    Thank You for helping me with loan once again in my sincerely heart I'm forever grateful.

    ReplyDelete