How Fast Must a Muon Be Moving If It Looks

question 13

Multiple Choice

How fast must a muon be moving if it looks to an observer at rest that it lived for 2 × 10⁻⁴ seconds before it decayed when,in fact,it lived for only 2 × 10⁻⁶ seconds in its moving reference frame?

• A)0.05c
• B)0.50c
• C)0.95c
• D)0.995c
• E)0.99995c

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