A Pion Lives 26 Ns in Its Rest Frame, but an Observer

question 26

Multiple Choice

A pion lives 26 ns in its rest frame, but an observer in a laboratory in which the particle moves at a speed of 2.7 × 10⁸ m/s says the particle lived

• A) 11 ns.
• B) 15 ns.
• C) 43 ns.
• D) 60 ns.
• E) 79 ns.

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