Sound Intensity of a Whisper?

  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. Redbelly98

    Redbelly98 12,046
    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?
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