A Pion Is an Unstable Particle That Has a Mean

Multiple Choice

A pion is an unstable particle that has a mean lifetime of 2.55 × 10^-8 s.This is the time interval between its creation in a nuclear process and its extinction into decay products,as measured in a frame of reference at rest with respect to the pion.An average pion is traveling at 0.230c relative to Earth.How far does it travel in its lifetime,relative to Earth?

A) 2.07 m
B) 1.81 m
C) 2.23 m
D) 3.22 m
E) 3.50 m