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Homework Help: Log + Ritcher Scale

  1. Dec 11, 2007 #1
    1. The problem statement, all variables and given/known data

    See image

    2. Relevant equations

    M = log(I_i / I_o)

    3. The attempt at a solution

    See image

    8bha909.png
     
  2. jcsd
  3. Dec 11, 2007 #2
    No, no... you are making it far too complicated.

    What is [tex] I_X [/tex] in terms of [tex] I_E [/tex] ? In other words, what number do you have to multiply [tex] I_E [/tex] by to get [tex] I_X [/tex]?
    Then get rid of [tex] I_X [/tex] in your equation.
    Finally think about what multiplication inside of a log function maps to on the outside. I'll give you a clue on the last one and it is +.
     
    Last edited: Dec 11, 2007
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