The Lifetime of a Π⁺ Meson Normally Is 18 Nanoseconds

question 20

Multiple Choice

The lifetime of a Π⁺ meson normally is 18 nanoseconds.In a large particle accelerator,scientists can create p+ mesons moving at speeds very close to the speed of light.What do the scientists observe when they measure the lifetime of a Π⁺ meson that is created at very high speed?

• A)The Π⁺ meson lasts 18 nanoseconds.
• B)The Π⁺ meson lasts much less than 18 nanoseconds.
• C)The Π⁺ meson lasts much more than 18 nanoseconds.
• D)The Π⁺ meson no longer decays,and remains as a stable particle.

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