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How Fast Must a Muon Be Moving If It Looks

Question 30

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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