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!

Half-life very difficult!

  1. May 15, 2003 #1
    a radioactive with a half-life of 5 days, has an initial activity of 4000 counts/min

    determine the activity after 10 days

    well because 1 half life is 5 days, so 10 days must be 2
    so 4000/(2^2)
    =1000 counts/min is that right?

    2. If the initial quantitiy of radioactive material is 200gms determine the amount left after 15 days have elapsed
    no of half lives = 3
    200/(2^3)
    =25 gms is that right?

    3. convert 4000 counts per min into bq's
    how do i do that?
     
  2. jcsd
  3. May 15, 2003 #2

    Tom Mattson

    User Avatar
    Staff Emeritus
    Science Advisor
    Gold Member

    Yes.

    Yes.

    You do it by looking up the definition of a bq in your book.
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?



Similar Discussions: Half-life very difficult!
  1. Half Life for patient (Replies: 1)

  2. Half life (Replies: 1)

  3. Half life (Replies: 2)

  4. Half Life (Replies: 4)

Loading...