Pions have a half-life, at rest, of 1.77 x 10-8 s. A collimated beam of pions leave an accelerator at 0.95c. What distance from the accelerator will the intensity be half?
The Attempt at a Solution
as you can probably tell from the title I really need some help getting started (not even sure on the topic), so thats problem 1. One thing I have been able to ascertain is that a pion is any one of three subatomic particles, thanks google&wiki! The question gives the half life at rest, that suggests to me that that(half life) is when the energy will be half of the original but there are two reasons why I cant see any use for that:
1. they are not at rest. does that change the half life?
2. I don't want to know when the energy is half I want to know when the Intensity is half and remembering sound stuff (not sure if it translates to this?) the two are not on a linear scale, ie. if energy goes down by half intensity does not necessarily?????
Intensity is watts/m^2 ( I think) so I=E/t/A so if I knew the initial energy I suspect I could easily find intensity.
Sorry about rambling a bit but I find that that helps people understand where I'm coming from and then help be "better".
Thanks for any Help...