math

posted by .

A loud speaker at a rock concert generates 102 W/m2 at 20m with a frequency of 1
kHz. Assume that the speaker spreads its intensity uniformly in all direction.
(a) What is the sound level ( = ?) at 20 m?
(b) What is the total acoustic power output of the speaker?
(c) At what distance will intensity level be at the pain threshold of 120 dB?
(d) Determine the sound intensity at a distance of 30 m?

Similar Questions

1. Math

At a concert, the loudness of sound, L, in decibels, is given by the equation L=10log(I/I_o), where I is the intensity, in watts per square metre, and I_o, is the minimum intensity of sound audible to the average person, or 1.0 x 10^-12 …
2. Math

At a concert, the loudness of sound, L, in decibels, is given by the equation L=10log(I/I_o), where I is the intensity, in watts per square metre, and I_o, is the minimum intensity of sound audible to the average person, or 1.0 x 10^-12 …
3. Physics

At a recent rock concert, a dB meter registered 118 dB when placed 1.60 m in front of a loudspeaker on the stage. (a) What was the power output of the speaker, assuming a hemispherical radiation of the sound and neglecting absorption …
4. physics

A student in the front row of a concert is at a distance of 2 m from the speaker. They hear the sound at 140dB. What is the sound intensity if the student walks 20 m away. What is the sound intensity at 2 m if there are 100 speakers …
5. physics

a speaker at a concert generates 1 x 10^-2 w/m^2 at a distance of 20m form the speaker at a frequency of 1kHz 1) calculate the wavelength of the waves emitted. b) what is the intensity level at 20m
6. physics

NEED HELP WITH ONLY PART C Two 135.1.0-W speakers, A and B, are separated by a distance D = 3.6 m. The speakers emit in-phase sound waves at a frequency f = 11800.0 Hz. Point P1 is located at x1= 4.50 m and y1 = 0 m; point P2 is located …
7. Physics

A speaker at an open-air concert emits 600 of sound power, radiated equally in all directions. a)What is the intensity of the sound 7.00 from of the speaker?
8. physics

An audio speaker at a concert emits sound uniformly in all directions at a rate of 100 W. (i) Calculate the sound intensity experienced by a listener at a distance of 8 m from the speaker. The listener moves back from the speaker to …
9. Physics

There is a band who uses 10000 W to radiate sound energy in all directions. What was the intensity of sound 10 meters from this speaker?
10. PreCalculas

The psychological sensation of loudness B is measured in decibels and is defined with reference to the intensity, , of a barely audible sound by the following equation. In this equation, I is the intensity of the sound in question. …

More Similar Questions