(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

A tiny vibrating source sends waves uniformly in all directions. An area of 3.25 cm2 on a

sphere of radius 2.50 m centered on the source receives energy at a rate of 4.20 J/s.

(a) What is the intensity of the waves at 2.50 m from the source and at 10.0 m from the

source?

(b) At what rate is energy leaving the vibrating source of the waves?

2. The attempt at a solution

I attemped the first part of the question using this equation :

I = P / A

A = 4 Pi r^2

so I = 4.2 / 4 * Pi * (2.5)^2 = 0.053

I asked my supervisor and he told me that my answer is wrong.

Any one who knows how i can go through this question ?

Thanks in advance

**Physics Forums | Science Articles, Homework Help, Discussion**

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Need help to find intensity of waves.

**Physics Forums | Science Articles, Homework Help, Discussion**