In the frame in which they are at rest, the number of muons at time t is given bywhere No...

In the frame in which they are at rest, the number of muons at time t is given by

where No is the number at t = 0 and T is the mean lifetime 2.2 μs. (a) If muons are produced at a height of 4.0 km, heading toward the ground at 0.93c, what fraction will survive to reach the ground? (b) What fraction would reach the ground if classical mechanics were valid?