# Intensity and Power

1. Nov 28, 2009

### sonutulsiani

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

A spherical sinusoidal source radiates sound uniformly in all directions. At a distance 10.0m the sound intensity level is 1.00 × 10−4 W/m2.

1. At what distance from the source is the intensity 1.00 × 10−6 W/m2?
A. 1 m
B. 10 m
C. 100 m
D. 1 km

2. What is the power radiated by this source?
A. Pav = 208 mW
B. Pav = 126 mW
C. Pav = 332 mW
D. Pav = 412 mW

2. Relevant equations

3. The attempt at a solution

I got 1 as 100 m and 2 as 126 watt, but I am not sure about the 2nd answer. So please help me. Thanks

2. Nov 28, 2009

### ideasrule

Both answers are correct. Why did you doubt your second answer?

3. Nov 28, 2009

### sonutulsiani

I doubt the 2nd answer because I get 0.126 watt, but the answer is in megawatt

4. Nov 28, 2009

### sonutulsiani

Did you get what i amsaying

5. Nov 28, 2009

### Redbelly98

Staff Emeritus
The answers are in milliwatts, not megawatts.