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Math Help - Cannot find L2 in equation

  1. #1
    Fitzy
    Guest

    Cannot find L2 in equation

    Hello all,I need help with a particulary sticky equation - L2 = L1 + 20*log10(d1^2/d2^2)where:L1=94 d1=1 d2=1500I'm given that the answer for this should be L2 =30.5 but i cannot seem to make it work!!!Please please help me - this is quite urgent! I would appreciate any comments!!Thanks very much
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  2. #2
    Senior Member ecMathGeek's Avatar
    Joined
    Mar 2007
    Posts
    436
    Quote Originally Posted by Fitzy View Post
    Hello all,I need help with a particulary sticky equation - L2 = L1 + 20*log10(d1^2/d2^2)where:L1=94 d1=1 d2=1500I'm given that the answer for this should be L2 =30.5 but i cannot seem to make it work!!!Please please help me - this is quite urgent! I would appreciate any comments!!Thanks very much
    Please try not to double post.

    -L2 = L1 + 20*log[10(d1^2/d2^2)]

    L1 = 94
    d1 = 1
    d2 = 1500
    L2 = 30.5 (or so you say)

    -L2 = 94 + 20*log[10(1/1500^2)] = -13.04365

    Check to make sure the numbers are correct. Check also to make sure you are looking at the correct answer (in the back of the book, I assume).
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