Sound Intensity Sound Level And Decibels
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1
2Physics 07-04 Sound Intensity and Sound Level
Name: ____________________________
Sound Intensity
Sound waves carry _______________ that can do _______________
Amount of _______________ transported per _______________ = _______________
As sound moves away from a _______________, it spreads out over a _______________ and
larger _______________
As the areas get _______________, intensity at any 1 point is _______________
��
�� =
��
Units: W/m
2
o
If sound is transmitted _______________ in all directions, the areas are the surfaces of _______________.
2
��
= 4����
����ℎ������
Intensity is proportional to _______________
( �� )
2
�� =
2����
��
Where �� = pressure amplitude, �� = density of the medium, ��
= speed of the wave
��
You and a friend are watching fireworks that are launching from the observatory. You are standing right in front of Berman
Hall (150 m) and your friend is across campus at AA (700 m). The sound intensity at AA is 0.2 W/m
. What is the sound
2
intensity at your location, and how much power is the firework emitting?
Sound Level and Decibels
Unit of measure to _______________ two
sound _______________.
Based on how human ear perceives
_______________.
If you _______________ the intensity, I, the
sound is _______________ twice as loud.
Use a ___________________ scale
Intensity Level
��
�� = ( 10 ���� ) log (
)
��
0
where = intensity level , I
o
and I
are intensities of two
0
sounds
I
is usually _______________ W/m
2
0
Unit: dB (decibel)
o
An intensity level of _______________ only
means that I = I
since log (1) = 0
0
Intensity can be _______________
Loudness is simply how ear _______________
Doubling _______________ does not double _______________
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