Calculating Sound Energy from Isotropic Loudspeaker

AI Thread Summary
To calculate the sound energy produced by an isotropic loudspeaker, the sound level of 66 dB at a distance of 24 m must first be converted to Watts. The intensity of sound is related to the distance from the source, typically following an inverse square law where energy decreases with the square of the distance. The discussion highlights the need for a formula that incorporates distance to determine the rate of sound energy production. Participants are encouraged to reference their textbooks for relevant equations that include distance in their calculations. Understanding these principles is essential for solving the problem effectively.
Jtappan
Messages
95
Reaction score
0
1. Homework Statement

The sound level 24 m from a loudspeaker is 66 dB. What is the rate at which sound energy is produced by the loudspeaker, assuming it to be an isotropic source?

____W

2. Homework Equations

?

Something to do with Intensity?

3. The Attempt at a Solution

I don't know where to begin on this problem. My book doesn't describe any problems that are related to distance nor does it have any equations that are related to distance.
 
Physics news on Phys.org
First, convert the 66dB to Watts. (http://en.wikipedia.org/wiki/Decibel) look in the example section if you don't know how to do that. This will give you the energy rate 24m away.

Next, you'll need to find some formula which relates how energy falls off with distance...any ideas? Look in your book for a formula with (distance)^2 in the denominator.
 
Thread 'Collision of a bullet on a rod-string system: query'

Thread 'Collision of a bullet on a rod-string system: query'

In this question, I have a question. I am NOT trying to solve it, but it is just a conceptual question. Consider the point on the rod, which connects the string and the rod. My question: just before and after the collision, is ANGULAR momentum CONSERVED about this point? Lets call the point which connects the string and rod as P. Why am I asking this? : it is clear from the scenario that the point of concern, which connects the string and the rod, moves in a circular path due to the string...
View full post »
Thread 'A cylinder connected to a hanged mass'

Thread 'A cylinder connected to a hanged 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

Sound Power Level (SPL) of a loudspeaker
Replies
11
Views
2K
Calculating Sound Intensity 24 m from a Loudspeaker
Replies
1
Views
3K
Loudspeaker Question (Sound and Intensity)
Replies
1
Views
3K
Measuring the Speed of Sound: Examining the Frequency of Clicks
Replies
3
Views
4K
Calculating Power at source from Intensity at distance R
Replies
1
Views
4K
Solving Loudspeaker Delay in 30ms for 5.0m
Replies
7
Views
2K
What is the Maximum Wavelength for Constructive Interference of Sound Waves?
Replies
3
Views
3K
Waves: Calculate the sound intensity from two speakers
Replies
3
Views
3K
Sound Wave Interference Problem
Replies
5
Views
2K
When does a sound echo not disturb its listener
Replies
4
Views
1K

Hot Threads

Recent Insights

Back
Top