A Particle Physicist Observes Cosmic Rays Creating a New Particle

question 11

Multiple Choice

A particle physicist observes cosmic rays creating a new particle high in the atmosphere,and the speed of this particle is measured at 99.7% the speed of light.It is unstable,and is observed to decay in an average 37.0 μs.If this particle were at rest in the laboratory,what would be its average lifetime?

• A)2.9 µs
• B)18 µs
• C)5.3 µs
• D)12 µs
• E)4.3 µs

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