Re: a special relativity theory problem


"francisco" <paco1955@xxxxxxxxxxxxx> wrote in message
news:%ynQe.138$v83.18@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> muons are elementary particles with a (proper) lifetime of 2.2
> microseconds. they are produced with very high speeds in the upper
> atmosphere when cosmic rays (high-energy particles from space) collide
> with air molecules.
>
> take the height L0 of the atmosphere (its rest length) to be 100 km in the
> reference frame of the Earth, and find the minimum speed that will enable
> the muons to survive the journey to the surface of the Earth. solve this
> problem in two ways: (a) in the Earth's frame of reference and (b) in the
> muon's frame of reference.
>


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