1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Intensity and Power

  1. Nov 28, 2009 #1
    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. jcsd
  3. Nov 28, 2009 #2


    User Avatar
    Homework Helper

    Both answers are correct. Why did you doubt your second answer?
  4. Nov 28, 2009 #3
    I doubt the 2nd answer because I get 0.126 watt, but the answer is in megawatt
  5. Nov 28, 2009 #4
    Did you get what i amsaying
  6. Nov 28, 2009 #5


    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    The answers are in milliwatts, not megawatts.
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: Intensity and Power