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Siren Sound physics question

  1. Jan 31, 2010 #1
    1. The problem statement, all variables and given/known data

    Residents of Hawaii are warned of the approach of a tsunami by sirens mounted on the tops of towers. Suppose a siren produces a sound that has an intensity level of 120 dB at a distance of 2.0m.

    2. Relevant equations

    I = P / 4[tex]\pi[/tex]r[tex]^{2}[/tex]

    3. The attempt at a solution

    I calculated I at 2m: I = 1 w/m^2
    P at 2m and 1 w/m^2 = 50.26548

    I just don't know what values I should use to calculate r.
  2. jcsd
  3. Jan 31, 2010 #2


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    Staff Emeritus
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    You did not post the actual question. :confused:
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