# Siren Sound physics question

1. Jan 31, 2010

### yaser1989

1. The problem statement, all variables and given/known data

Residents of Hawaii are warned of the approach of a tsunami by sirens mounted on the tops of towers. Suppose a siren produces a sound that has an intensity level of 120 dB at a distance of 2.0m.

2. Relevant equations

I = P / 4$$\pi$$r$$^{2}$$

3. The attempt at a solution

I calculated I at 2m: I = 1 w/m^2
P at 2m and 1 w/m^2 = 50.26548

I just don't know what values I should use to calculate r.

2. Jan 31, 2010

### Redbelly98

Staff Emeritus
You did not post the actual question.