
#1
Oct709, 07:43 AM

P: 146

1. The problem statement, all variables and given/known data
The mean lifetime of pions at rest is to=2.6x10^8. if a beam of pions has a speed v=0.85c a)what would their lifetime be in the laboratory? b)how far would they travel before they decay? c)what would your answer to b) if you neglect time dilation d)what would the "proper mean lifetime" be? 2. Relevant equations 3. The attempt at a solution i think done ac right but dont really know how to do d) my answers a)4.94x10^8 b)12.5 m c)6.63m im not sure how to calculate the proper mean lifetime can anyone help? 


Register to reply 
Related Discussions  
"Proper" description of uniform circular motion  Introductory Physics Homework  3  
Proper use of the term "Sourcefree".  General Physics  2  
"Proper" accelerations and rigid bodies.  Special & General Relativity  33  
Finding the "proper time"  Advanced Physics Homework  1  
The proper article to use in the sentence "A/An NaI detector"  General Discussion  39 