Within the system of the muon, which relavisitic effect increases the probability for the muon to reach the Earth surface?
Length contraction of the distance to Earth.
Time dilation of its mean-life.
Both of the above.
None the above, the probability is lower in the system of the muon.
The Attempt at a Solution
I thought it was both, but the online homework system says that length is correct. am i wrong and why?