I try to determine the speed of muons. In an book I have there's an exercise regarding muons.(adsbygoogle = window.adsbygoogle || []).push({});

Given that they half of them decay in [itex]2.2 * 10^{-6}[/itex] s, how fast do they have to travel if half of them is to reach earth, ocean floor?

I tried to calculate the speed but I get to a point where I have two unknowns and one equation...

[itex]t' = \gamma t[/itex]

How do I get further..? Assuming a speed close to c to get a t', or?

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# Speed of muon

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