The mean lifetime of stationary muons is measured to be 2.2000 μs. the mean lifetime of high-speed muons in a burst of cosmic rays observed from earth is measured to be 15.870 μs. to five significant figures, what is the speed parameter β of these cosmic-ray muons relative to earth?

The speed parameter β of these cosmic-ray is 0.990.

Explanation:

Given that,

Mean lifetime

time  

We need to calculate the speed parameter

Using formula of time

Where,

Put the value of into the formula

Put the value into the formula

Hence,  The speed parameter β of these cosmic-ray is 0.990.

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