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Pressure Amplitude Question

  1. Oct 16, 2008 #1
    1. The problem statement, all variables and given/known data
    What is the pressure amplitude in sound wave with intensity level of 65 dB?


    3. The attempt at a solution
    My textbook does not provide any instruction on how pressure amplitude is related to the intensity level. It does not even define what pressure amplitude is. While I can calculate the intensity (P/A) from decibels, I do not know how to calculate pressure amplitude. Please help.
     
  2. jcsd
  3. Oct 16, 2008 #2

    mgb_phys

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  4. Oct 16, 2008 #3
    Ok, so here's my attempt at solution..
    I = POWER/AREA = FORCE * VELOCITY / AREA
    PRESSURE = FORCE/AREA
    PRESSURE = I / VELOCITY.
    Since we are talking about sound, I suppose it is PRESSURE = I / V_SOUND (340), where I calculated I to be (I_0) (10^6.5).
    But this doesn't seem to give the right answer (according to the answer key). What's the issue here?
     
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