Question

The mean of life of π meson is 2*10^-8 s. Calculate mean life of a meson moving with a velocity of 0.8 c.

Answer 1

∆t = t / √(1-v²/c²)

∆t = 2*10^-8/√(1-(0.8)²)

∆t = 2*10^-8 / 0.6

∆t = 3.3*10^-8 s