1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Sound waves and eardrum problem

  1. Mar 8, 2006 #1
    A 50 dB sound wave strikes an eardrum whose area is 4.1 * 10-5 m2.
    (a) How much energy is absorbed by the eardrum per second?
    (b) At this rate, how long would it take your eardrum to receive a total energy of 1.0 J?

    I have tried to solve using I=2pi^2f^2A^2pv

    and got f=280 ; v=343;p=1.29;I=1*10^-12 and A =1.28e-18 its wrong though
  2. jcsd
  3. Mar 8, 2006 #2

    Andrew Mason

    User Avatar
    Science Advisor
    Homework Helper

    Decibels are a little tricky to work with. I think all you need to know is that [itex]I = 10 log(P/P_0) [/itex] where P is the power/area and [itex]P_0 = 10^{-12} W/m^2[/itex]

Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Sound waves and eardrum problem
  1. Sound wave problem (Replies: 3)