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Homework Help: Radioactive decay

  1. Jan 4, 2008 #1
    [SOLVED] Radioactive decay

    Hi guys, this is just a basic maths incompetency. I hope someone can guide me forwards! (Slack biology student, delving into physics)




    I can do (a) with no problems, and thus I can probably do the latter half of (b) and (c) without issue. My stumbling point is in actually rearranging the above equation to isolate the term I want. I have this:
    http://img410.imageshack.us/img410/3239/hlea6.png [Broken]

    - but I don't know how to get 't' where I want it! I've been googling how to manipulate powers properly, but no joy. What can I say... no maths since I was 16! :-)

    Cheers all.

    Tim
     
    Last edited by a moderator: May 3, 2017
  2. jcsd
  3. Jan 4, 2008 #2

    Kurdt

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    You'll want to take the logarithm to base 2 of both sides.

    More info: http://www.counton.org/alevel/pure/purtutloglaw.htm [Broken]
     
    Last edited by a moderator: May 3, 2017
  4. Jan 5, 2008 #3
    Thanks Kurdt. A much-appreciated pointer.

    Does that mean that the following is true?:
    http://img259.imageshack.us/img259/7027/screenshot3ch4.png [Broken]

    It was this youtube video that took me there... http://youtube.com/watch?v=OS-EnAFKWpI
    Seems like a great resource for basic maths tips.
     
    Last edited by a moderator: May 3, 2017
  5. Jan 5, 2008 #4

    Kurdt

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    Nice video. Yes you are correct.
     
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