1. Limited time only! Sign up for a free 30min personal 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!

Percentage transmittance gamma ray through lead

  1. May 25, 2017 #1
    1. The problem statement, all variables and given/known data
    I = Io e-ux.PNG

    2. Relevant equations
    I = Io e^-ux

    3. The attempt at a solution
    0.75 = 1 * e^-u1
    using algebra... u =2.117

    I = 1 * e^-2.117*3
    I = 0.00175

    Answer is apparently 42.2. Can someone tell me where i went wrong? Thanks for any help as always
  2. jcsd
  3. May 25, 2017 #2


    User Avatar
    Staff Emeritus
    Science Advisor

    Check your math. When I put ##e^{-2.117}## into my calculator, I don't get 0.75.
  4. May 25, 2017 #3
    omfg i got it. thanks a lot i derped out with the log rules.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted

Similar Discussions: Percentage transmittance gamma ray through lead
  1. Gamma Rays (Replies: 4)

  2. Gamma Ray experiment (Replies: 2)

  3. Gamma ray experiment (Replies: 4)