What is the sound intensity level of a jet at 1000 feet?

AI Thread Summary
A jet at 5000 feet produces a sound intensity level of 80 dB, and the discussion focuses on calculating the sound intensity level at 1000 feet. The relationship between sound intensity and distance is explored, specifically using the formula P=IA, where P is power, I is intensity, and A is the area. Participants express confusion regarding the radius and how to apply the formula without knowing the actual radius. The conversation emphasizes the need to clarify the origin point for radius measurements to accurately calculate the intensity at the lower altitude. Understanding these relationships is crucial for determining the sound intensity level of the jet at 1000 feet.
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Homework Statement



A jet traveling 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?


Homework Equations





The Attempt at a Solution

 
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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:
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?
 
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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