-
Pf= 1,000 Watts
Pi= 10 Watts
What is the change in the dB?
-
100 =
101 =
102 =
103 =
- 100 = 1
- 101 = 10
- 102 = 100
- 103 = 1000
-
3dB =
Doubling the intensity
-
6dB =
Increasing intensity by a factor of 4
-
9dB =
Increasing intensity by a factor of 8
-
10dB =
Increasing intensity by a factor of 10
-
-3dB =
Decreasing to 1/2 of the original intensity (decrease by a factor of 2)
-
-6dB =
Decreasing to 1/4 of the original intensity (decrease by a factor of 4)
-
-9dB =
Decreasing to 1/8 of the original intensity (decrease by a factor of 8)
-
-10dB =
Decreasing to 1/10 of the original intensity (decrease by a factor of 10)
-
The frequency is determined strictly the the wave _____.
The frequency is determined strictly the the wave source.
-
The period of a wave is determined strictly by the wave ______.
The period of a wave is determined strictly by the wave source.
-
The propagation velocity is determined strictly by the properties of the ______.
The propagation velocity is determined strictly by the properties of the medium.
-
The wave source cannot change the _________ _______ which is strictly determined by the properties of the ______.
The wave source cannot change the propagation velocity which is strictly determined by the properties of the medium.
-
The two properties of the medium which determine the propagation velocity are _____ (related to density) and ______ (related to compressibility and stiffness).
- The two properties of the medium which determine the propagation
- velocity are inertia (related to density) and elasticity (related to
- compressibility and stiffness).
-
The propagation velocity _____ with increased density, assuming no change in stiffness.
The propagation velocity decreases with increased density, assuming no change in stiffness.
-
As the density decreases, the propagation velocity ______, assuming no changes in stiffness.
As the density decreases, the propagation velocity increases, assuming no changes in stiffness.
-
As the stiffness increases, the propagation velocity ______.
As the stiffness increases, the propagation velocity increases.
-
A stiff material is not very elastic, so stiffness and elasticity are _______ related.
A stiff material is not very elastic, so stiffness and elasticity are inversely related.
-
A material which is inelastic is a stiff material, and therefore has a high ______ ______.
A material which is inelastic is a stiff material, and therefore has a high propagation velocity.
-
Inelasticity and incompressibility are related to _______.
Inelasticity and incompressibility are related to stiffness.
-
Elasticity and __________ are inversely related.
Elasticity and compressibility are inversely related.
-
A gas is generally more compressible than a _____ which is generally more compressible than a solid.
A gas is generally more compressible than a liquid which is generally more compressible than a solid.
-
Air is more compressible than bone and has a much ____ ________ ________.
Air is more compressible than bone and has a much lower propagation velocity.
-
_______ is sound below human hearing.
Infrasound is sound below human hearing.
-
_______ sound is sound within human hearing.
Audible sound is sound within human hearing.
-
________ is sound above human hearing.
Ultrasound is sound above human hearing.
-
________ ultrasound is approximately from 2 MHz to 10MHz.
Diagnostic ultrasound is approximately from 2 MHz to 10MHz.
-
All sound waves are ________ mechanical waves.
All sound waves are longitudinal mechanical waves.
-
Human hearing is approximately ___ to ___.
Human hearing is approximately 20Hz to 20kHz.
-
Infrasound is sound below ___.
Infrasound is sound below 20Hz.
-
Ultrasound is any sound above ___.
Ultrasound is any sound above 20kHz.
|
|