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.
phytitan
Messages
2
Reaction score
0

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

 
Physics news on Phys.org
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?
 

Thread 'Errors and significant figures'

I multiplied the values first without the error limit. Got 19.38. rounded it off to 2 significant figures since the given data has 2 significant figures. So = 19. For error I used the above formula. It comes out about 1.48. Now my question is. Should I write the answer as 19±1.5 (rounding 1.48 to 2 significant figures) OR should I write it as 19±1. So in short, should the error have same number of significant figures as the mean value or should it have the same number of decimal places as...
View full post »
Thread 'A cylinder connected to a hanging mass'

Thread 'A cylinder connected to a hanging mass'

Let's declare that for the cylinder, mass = M = 10 kg Radius = R = 4 m For the wall and the floor, Friction coeff = ##\mu## = 0.5 For the hanging mass, mass = m = 11 kg First, we divide the force according to their respective plane (x and y thing, correct me if I'm wrong) and according to which, cylinder or the hanging mass, they're working on. Force on the hanging mass $$mg - T = ma$$ Force(Cylinder) on y $$N_f + f_w - Mg = 0$$ Force(Cylinder) on x $$T + f_f - N_w = Ma$$ There's also...
View full post »

Similar threads

Ratio of Intensities of 2 sounds
Replies
5
Views
2K
Calculating τ by knowing I is proportional to A^2
Replies
8
Views
2K
Sound intensity of a thunderbolt
Replies
1
Views
1K
B Sound Intensity doubles if number of noise sources double?
Replies
7
Views
1K
Sound Intensity: Reduce by 35 dB, Factor Calculation
Replies
4
Views
6K
Sound Intensity (Level) - Hearing Aid
Replies
5
Views
2K
Total sound intensity from sources
Replies
11
Views
3K
Audio interference of sound waves from two speakers
Replies
19
Views
4K
Problem on Doppler effect and sound level
Replies
1
Views
2K
Calculating Sound Intensity and Pressure Variation at a Distance
Replies
4
Views
2K

Hot Threads

Recent Insights

Back
Top