Learning Object

1. Intensity of Sound
Waves

2. Question 1:
 If someone yells isotropically with
a sound intensity of 0.1 W/m^2,
and you are standing 15m away,
what is the power of the person
yelling?

3. Solution:
 Use the equation P=I4(pi)(r^2)
 Plug in the intensity, and the
distance you are standing away
from them
 Your answer will be: 283 W

4. Question 2:
 The last question was simplified
assuming the person was yelling
isotropically, which is not realistic
as they would be facing and yelling
more prominently in one direction
 Take some time to consider what
the difference in power would be
with this new knowledge that the
person was not yelling isotropically

5. Hints:
 The sound intensity would be
greater if someone yelled in a
fixed direction, thereby decreasing
the power