Time dilation of unstable particles · CAP 2015 #20
Physics
Problem
Unstable elementary particles are produced traveling at v = 0.6c with respect to an observer in a laboratory. These particles have a typical intrinsic lifetime of 100ns. In the frame of the observer, how long will the particles typically last before decaying?
a) They won't decay while moving
b) 100 ns
c) 125 ns
d) 175 ns
e) 80 ns