Question

A person shouting at the top of his lungs emits aboue 1.0 w of energy as sound waves. What is the sound intensity 1.0 m from such a person

Answer 1

Answer:

$I=0.0795\ W/m^2$

Explanation:

When a person shouts it emits 1 W of energy as sound waves, P = 1 W

Let I is the sound intensity 1 meters from such a person. We know that the power per unit area is called the sound intensity of the person. Its formula is given by :

$I=\dfrac{P}{A}$

$I=\dfrac{P}{4\pi r^2}$

$I=\dfrac{1\ W}{4\pi (1\ m)^2}$  

$I=0.0795\ W/m^2$

So, the sound intensity of such a person is $0.0795\ W/m^2$. Hence, this is the required solution.