A Certain Unstable Particle Has a Mean Lifetime of 1

Multiple Choice

A certain unstable particle has a mean lifetime of 1.52 × 10^-6 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 particle.An average such particle is observed by a scientist on Earth to travel 342 m in its lifetime.What is the speed of the particle relative to Earth? (c = 3.00 × 10⁸ m/s)

A) 0.821c
B) 0.681c
C) 0.600c
D) 0.551c
E) 0.335c