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 Intensity of a Whisper?

  1. Nov 19, 2008 #1
    1. The problem statement, all variables and given/known data
    A. What is the sound intensity of a whisper at a distance of 3.5 m, in W/m2?
    I know that a whisper is approximately 20 dB and P = 10-10 W/m2.

    B. What is the corresponding sound intensity level in dB?

    2. Relevant equations
    I = Power/[(4pi)(3.5m)2)
    dB = 10 log (I/Io).

    3. The attempt at a solution
    I = 6.50*10-13

    dB = -1.87 (I used 10-12 W/m2 for Io)
  2. jcsd
  3. Nov 20, 2008 #2


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    dB level would depend on how far away you are. You know it's 20 dB at what distance from the whisperer?
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Sound Intensity of a Whisper?
  1. Sound intensities (Replies: 1)

  2. Intensity of sound (Replies: 5)