Question

A speaker emits sound waves in all directions, and at a distance of 28 m from it the intensity level is 73 db. What is the total power put out by the speaker, in watts?

Answer 1

P=0.197 Watt

Step-by-step explanation:

Given That

B=73dB

Io= 1 * 10^-12

`I=Io * 10^{(B)/(10) } \\I=2 * 10^(-5) Wm^(-2) \\A=4 * pi * r^(2)\\ A=9852.03 m^(2)\\ Power= I * A\\P= 0.197 Watt`