SOLVED:μmesons. The proper mean life of the μmeson is approximately 2 ×10^-6  s. Suppose that a large burst of μmesons produced at some height in the atmosphere travels downward at v=0.99 c . The number of collisions in the atmosphere on the way down is small. (a) If 1 percent of those in the original burst survive to reach the earth's surface, estimate the original height. [In the μmeson frame of reference the number of particles which survive to a time t is given by .N(t)=N(0) e^-t / τ .] Ans.

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