Question
Suppose a $W^-$ created in a bubble chamber lives for $5.00\times 10^{-25}\textrm{ s}$. What distance does it move in this time if it is travelling at $0.900c$? Since this distance is too short to make a track, the presence of the $W^-$ must be inferred from its decay products. Note that the time is longer than the given $W^-$ lifetime, which can be due to the statistical nature of decay or due to time dilation.
$0.135\textrm{ fm}$
Solution Video