Recent content by wannie112

  1. W

    Age of rocks calculation - I only need little help

    I see :D Now I understand everything, thank you!
  2. W

    Age of rocks calculation - I only need little help

    oo thank you :)..and my way is correct do I have to do any formulas? Thank you very much ^^
  3. W

    Age of rocks calculation - I only need little help

    Hmm? You didn't really explain anything...how did you get to 32? I got to 5.
  4. W

    Age of rocks calculation - I only need little help

    How many half lives have passed since a particular rock was formed if a sample of the rock contains 31 times as much lead-207 than uranium-235? I know that I need to do a table and calculate I know how to do this question but the thing I need help on is how do I know the number of atoms in order...