1. Not finding help here? Sign up for a free 30min 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 wave and energy can you help me?

  1. Mar 16, 2007 #1
    A sound wave with intensity 2x10^(-3) W/m^2 is perceived to be modestly loud. Your eardrum is 6.0 mm in diameter. How much energy will be transferred to your eardrum while listening to this sound for 1.0 min?

    =2x10^(-3) * (pi (6x10^-3)^2)
    =2.2610x10^-7 W

    P=delta E/ delta t
    =2.2610x10^-7 J/s * 60 s
    =1.3572x10^-5 J

    But this is not the right answer. I have no idea what I did wrong. Can someone please help me? Any help is greatly appreciated! Thanks!
  2. jcsd
  3. Mar 16, 2007 #2


    User Avatar
    Science Advisor
    Homework Helper

    For one thing the diameter is 6mm. Not the radius. Change your pi*r^2 number.
  4. Mar 16, 2007 #3
    Thanks for pointing it out! I rarely make this kind of silly mistake:surprised
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?

Similar Discussions: Sound wave and energy can you help me?
  1. Can you help me? (Replies: 1)

  2. Can you help me? (Replies: 2)