Pi Mesons at Rest Have a Half-Life of T $\beta$ C, the Distance in Which the Intensity of the Beam

question 41

Multiple Choice

Pi mesons at rest have a half-life of T. If a beam of pi mesons is traveling at a speed of v = $\beta$ c, the distance in which the intensity of the beam is halved is:

• A) c\(\beta\)T(1 - \(\beta\)²)^-1/2
• B) c\(\beta\)T[(1 + \(\beta\))/(1 - \(\beta\))]^1/2
• C) \(\beta\)vT
• D) (1 - \(\beta\)²)^1/2vT
• E) none of the above