# algebra

A sound power level reading of 127 dB was taken near a construction site
where chippers were being used. When all but one of the chippers stopped working,
the sound power level reading was 120 dB. Estimate the number of chippers in
operation when the reading of 127 was obtained. Assume that the sources
may be treated as ideal point sources located at the same point.

1. 👍
2. 👎
3. 👁
1. 7 dB higher sound level (initially) corresponds to an intensity ratio I1/I2 given by

10*Log(10)I1/I2 = 7

Log(10)I1/I2 = 0.7
I1/I2 = 10^0.7 = 5.0

There were 5 chippers working initially

1. 👍
2. 👎
2. thanks!

1. 👍
2. 👎

## Similar Questions

1. ### Math

Log functions: A new car has an interior sound level of 70 dB at 50 km h. A second car, at the same speed, has an interior sound level that is two times more intense than that of the new car. Calculate the sound level inside the

2. ### Physics

The intensity due to a number of indipendent sound sources is the sum of the individual intensities. A) When four quadruplets cry simultaneously, how many decibels greater is the sound intensity level than when a single one cries?

3. ### Project Mangament

I am doing on a project on Building Home Depot. how would I go to found the cost, construction engineer, roofing contractor, plumbing contractor, HVAC contractor, steel erection and electric contractor. Install temporary power,set

4. ### physics

19 cars in a circle at a boom box competition produce a 130 dB sound level at the center of the circle. What is the average sound level(dB) produced there by each, assuming interference effects can be neglected? Please someone

A source emits sound uniformly in all directions. There are no reflections of the sound. At a distance of 12 m from the source, the intensity of the sound is 1.7 × 10-3 W/m2. What is the total sound power P emitted by the source?

2. ### physics

A person standing 1.00 m from a portable speaker hears its sound at an intensity of 7.50  103 W/m2. (a) Find the corresponding decibel level. (b) Find the sound intensity at a distance of 35.0 m, assuming the sound

3. ### Chemistry

What elements contains a full third energy level and what element contains the first p electron?? Here is an interactive site that will show you how the 1s, 2s, 2p, etc levels fill. Post your answers here if you want someone to

4. ### Physics

Part One: The decibel level of the noise from a jet aircraft is 130 dB when measured 19.3 m from the aircraft. How much sound power does the jet aircraft emit? Answer in units of W - 46673.5W I need help with Part Two: Part Two:

1. ### LOGS

The decibel level of a sound is given by dB=10log(EE0), where E0=10−12wattsm2 and E is the intensity of the sound. (a) Find the intensity of a 80-decibel sound. E= watts per square meter. (b) How many times more intense is the

2. ### GOVERNMENT HELP

Since 1789, the expansion of power of the National Government has been caused by all of the following EXCEPT a. strict construction of the Constitution b. liberal construction of the Constitution c. technological advances d.

3. ### PreCalc

The decibel (dB) is defined as dB= 10log (P2/P1), where P2 is the power of a particular signal. P1 is the power of some reference signal. In the case of sounds, the reference signal is a sound level that is just barely audible.How

4. ### Physics

A small omni directional source of noisy sound emits uniformly with a power of 40W.Determine the distance from the source for which the sound level is 90dB. Calculate also the intensity level at a point 100m from the source. (if