1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Checking my probability

  1. Jan 16, 2006 #1

    nrm

    User Avatar

    I was hoping that somebody would check my work. Any input is appreciated.
    A decay rate of a radioactive sample is being measured using a Geiger counter. During a 10 second measurement 100 decays are registered.
    what is the error associated with the result?
    [tex]\sigma_{y} = \frac{\sigma}{\sqrt{N}}[/tex]
    My work:
    [tex]\sigma^2 = np = (100)(1/10) = 10[/tex]
    so [tex]\sigma = \sqrt{10}[/tex]
    putting this into the previous equation where I make N=100 I get an error around 0.316. Did I do that right?
     
  2. jcsd
  3. Jan 17, 2006 #2
    If you are loking for the standard deviation for the count rate, then your correct equation should be sqrt(n)/t where n is your count and t is the count time. If you are looking for the standard deviation for the count, then it's just sqrt (n).
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Checking my probability
Loading...