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

[azatkgz]

Just simple question to check

Homework Statement

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?

The Attempt at a Solution

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

 

[learningphysics]

Yes, that's right.

 

[azatkgz]

Thanks.