Results 1 to 2 of 2

Math Help - exponential functions and logarithms

  1. #1
    Newbie
    Joined
    Oct 2009
    Posts
    8

    exponential functions and logarithms

    Do you know how I could figure this out?

    Let Lo represent the loudness of a sound at 0dB, the threshold of hearing.

    a) write an equation to express the loudness , L, of a sound with decibel level, d.

    I know that this answer is Lo= Lo(10) d/10

    b) How many times as loud as a heavy truck is an air conditioner?
    the heavy truck is 90 dB and an air conditioner is 65.
    Follow Math Help Forum on Facebook and Google+

  2. #2
    Senior Member pacman's Avatar
    Joined
    Jul 2009
    Posts
    448
    from wikipedia, the formula are these:

    ,

    Rearranging the above equation gives the following formula for P1 in terms of P0 and LdB:
    . Since a bel is equal to ten decibels, the corresponding formulae for measurement in bels (LB) are
    .

    why not substitute the values?


    Follow Math Help Forum on Facebook and Google+

Similar Math Help Forum Discussions

  1. Exponential Functions and Logarithms?
    Posted in the Algebra Forum
    Replies: 6
    Last Post: August 17th 2010, 02:59 AM
  2. Logarithms and exponential models
    Posted in the Pre-Calculus Forum
    Replies: 2
    Last Post: March 9th 2009, 05:53 PM
  3. Replies: 1
    Last Post: October 13th 2008, 09:07 PM
  4. Logarithms and Exponential Functions
    Posted in the Calculus Forum
    Replies: 0
    Last Post: June 14th 2008, 11:39 PM
  5. Exponential Functions & Logarithms Questions
    Posted in the Algebra Forum
    Replies: 1
    Last Post: February 12th 2008, 02:19 PM

Search Tags


/mathhelpforum @mathhelpforum