- #1

Coushander

- 27

- 0

## Homework Statement

If the intensity level at distance d of one trombone is 70 dB, what is the intensity level of 76 identical trombones, all at distance d?

## Homework Equations

β = (10 dB) log

_{10}(I/I

_{0})

I

_{0}= 1.0 x 10

^{-12}W/m

^{2}

I = power/area

## The Attempt at a Solution

70db = 10db log

_{10}(I/I

_{0})

7db = log

_{10}(I/I

_{0})

10

^{7}= 10

^{log10(I/I0)}

10

^{7}= (I/I

_{0})

I = 0.00001 W/m

^{2}

Then I multiplied that by 76 and put it back in the general equation to generate β = 98db, which is wrong. β = 89db.