# How long does he live as it measured in his frame?

1. Oct 11, 2007

### azatkgz

Just simple question to check
1. The problem statement, all variables and given/known data
A muon formed in the high Earth's athmoshere travels at speed v=0.999c
for a distance of a L=4.6 km before he decays.How long does he live as it measured in his frame?

3. The attempt at a solution

$$t=\frac{L/\gamma}{v}$$

Last edited by a moderator: Jan 7, 2014
2. Oct 11, 2007

### learningphysics

Yes, that's right.

3. Oct 11, 2007

Thanks.