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## GR0877 Problem 39

PROBLEM STATEMENT: This problem is still being typed.

SOLUTION: (C) The lifetime of a muon in the laboratory is $\tau_l = \gamma \tau$, where $\gamma = 1/\sqrt{1 - 16/25} = 5/3$. The mean distance traveled is $l = v \tau_l = v \gamma \tau = \frac{4 \cdot 5}{5 \cdot 3} \cdot 3 \cdot 10^8 \cdot 2.2 \cdot 10^{-6} = 880$ (m).

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