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Simple Formula Manipulation

  1. Dec 8, 2007 #1
    I'm trying to find the intensity of something. I know the equation is

    B = 10log(I/Io)

    But how to I solve for I? What would the equation be? For some reason I can't make it work.
     
  2. jcsd
  3. Dec 8, 2007 #2

    Doc Al

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    Staff: Mentor

    logarithms

    Does this help?
    If [tex]a = log(b)[/tex]

    then [tex]b = 10^a[/tex]
     
  4. Dec 8, 2007 #3
    No, i still can't ge thte correct equation, i come up with something like (10x10^B)/Io
     
  5. Dec 8, 2007 #4
    Rewrite the equation as
    I/I0 = 10^(B/10)
     
    Last edited: Dec 8, 2007
  6. Dec 8, 2007 #5

    Doc Al

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    Staff: Mentor

    Not quite:
    B = 10log(I/Io)
    B/10 = log(I/Io)
    10^(B/10) = I/Io
    I = Io*10^(B/10)
     
  7. Dec 8, 2007 #6
    Thanks, that is kinda tricky, but now i understand it
     
  8. Dec 8, 2007 #7
    From the provided information, Doc Al's equation is correct. You may be using wrong values for your Io and B, or your intensity equation could be incorrect.
     
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