Question: Current Attempt in Progress The mean lifetime of certain subatomic particles is measured to be 3 . 2 7 6 7 us when they are

Current Attempt in Progress
The mean lifetime of certain subatomic particles is measured to be 3.2767 us when they are stationary. However, the mean lifetime of fast-moving particles of the same kind observed in a burst of cosmic rays is measured to be 21.498 us. What is the speed parameter B of these cosmic-ray particles relative to Earth?

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