Time dilation and length contraction help

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SUMMARY

The discussion focuses on calculating the distance a muon travels before decaying, given its average lifetime of 2.2 microseconds and a speed of 0.60c. The proper time is determined using the formula 2.2/Sqrt[1-(0.6c/c)^2], resulting in a time dilation of 2.75 microseconds. The conversation emphasizes that length contraction is not a factor for a stationary observer, as both the observer and the muon agree on their relative speeds. Additionally, a suggestion is made to utilize a 1+1 D space-time diagram for further understanding.

PREREQUISITES
  • Understanding of special relativity concepts, specifically time dilation and length contraction.
  • Familiarity with the formula for time dilation in special relativity.
  • Basic knowledge of muon properties and behavior in particle physics.
  • Ability to interpret space-time diagrams in the context of relativity.
NEXT STEPS
  • Study the derivation and applications of the time dilation formula in special relativity.
  • Learn about the properties and behavior of muons in high-energy physics experiments.
  • Explore the concept of length contraction and its implications in different reference frames.
  • Practice drawing and interpreting 1+1 D space-time diagrams for various scenarios in relativity.
USEFUL FOR

Physics students, educators, and anyone interested in understanding the implications of special relativity on particle behavior and time measurement.

dswatson
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The average lifetime of a muon is 2.2 microsec. What is the average distance the muon would travel in free space before decaying according to a stationary observer watching the muon travel with a speed of (.60c).

I know how to find the proper time.

2.2/Sqrt[1-(.6c/c)^2] = 2.2/Sqrt[1-.6^2] = 2.2*1.25 =2.75 microsec

thank you in advance for any help.
 
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Once you've found the proper time you're basically done. You don't have to worry about length contraction in this case because the observer isn't traveling at any speed. The objects agree on how fast they are traveling with respect to each other.

~Lyuokdea
 
It also may be instructive to draw a 1+1 D space-time diagram and see what is the x-value after you shift to the appropriate point on the hyperbola.
 

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