The Lifetime of a π⁺ Meson Normally Is 18 Nanoseconds

question 72

Multiple Choice

The lifetime of a π⁺ meson normally is 18 nanoseconds.In a large particle accelerator,scientists can create π⁺ 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 more than 18 nanoseconds.
• C)The π⁺ meson lasts much less than 18 nanoseconds.
• D)The π⁺ meson no longer decays and remains as a stable particle.

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