Solving Intensity and Power Homework: 100 m, 126 mW

[sonutulsiani]

Homework Statement

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

Homework Equations

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

 

[ideasrule]

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

 

[sonutulsiani]

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

 

[sonutulsiani]

Did you get what i amsaying

 

[Redbelly98]

The answers are in milliwatts, not megawatts.