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Homework Help: Sound intensity level of a jet

  1. May 18, 2010 #1
    1. The problem statement, all variables and given/known data

    A jet travelling overhead at an altitude of 5000 feet produces a sound intensity level of 80 dB. What would the figure be for an eight of 1000 feet?

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. May 18, 2010 #2
    If you know the intensity of the sound wave at a certain distance from the source, then you can find the power of the source. Do you remember the equation that relates the power to intensity? This is a good place to start.
    Last edited: May 19, 2010
  4. May 19, 2010 #3
    I have the intensity of the source and I would calculate the power with the formula P=I*A but I don't have the radius I just have a difference in the two radii. But it's an equation with two unknowns the actual radius and the power.

    r1=x at 5000 feet altitude
    r2=x + 4000 at 1000 feet altitude

    how can I calculate the intensity at 1000 feet?
  5. May 19, 2010 #4
    So we have the formula for power, P=IA. What is A in this formula? And when you say radius, with respect to what origin are you referring to? Radius is the distance from where to where?
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