A Beam of Unstable Neutral Pions Is Observed to Travel $\times$

question 55

Multiple Choice

A beam of unstable neutral pions is observed to travel on average 8 m before they decay.If their proper lifetime is 0.8 $\times$ 10^-8 s,then calculate how fast the beam is traveling.

• A)0.96c
• B)0.92c
• C)0.29c
• D)0.98c
• E)3.5c

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