Wave Characteristics And Sound Of Sound Flashcards
There are measurable quantities that vary within a medium as sound propagates.
Acoustic Variables
It is the amount of force in a given area
Pressure
Relationships of amplitude, power and intensity:
- ) ⬆️ Power = ____ intensity
- ) ⬆️ Area = ____ density
- ) ⬇️ Area = ____ intensity
- )⬆️
- )⬇️
- ) ⬆️
It is the distance moves by the molecules in the medium
Particle motion
It is the power per unit area
Intensity
Relationships of amplitude, power and intensity:
When power increases = intensity _______
increases
It isbthe rate at which the work is done
Power
The easier a medium is to reduce in volume =
The higher its compressibility
It is the concentration of matter
Density
It is the speed at which sound moves through a medium
Speed propagation
It refers to the ability if an object to return to its original shape.
Elasticity
It is the mass per unit volume
Density
What is the relationship of the velocity of sound in amedium to density?
Inversely proportional
It is the concentration of heat energy
Temperature
On n the basis of density alone, sound wave have greater velocity in ____ than in _____.
air, bone
Relationships of amplitude, power and intensity:
When area decreases = intensity _______, why?
Increases, bc power is more concentrated
What is the relationship of the velocity of sound through a medium to compressibility of the medium?
Inversely proportional
It is the measure of how far variable gets away from its normal undistributed value
Amplitude
Relationships of amplitude, power and intensity:
When area increases = density _______, why?
Decreases, bc power is less concentrated
It is the reciprocal of compressibility
Bulk modulus
It is the fraction of the incident intensity transmitted into the second medium
Intensity transmission coefficient
What is the relationship of the velocity of sound through a medium to the bulk modulud of the medium?
Directky proportional
When we combine the comressibility and density into an equation, we can determine?
Acoustic velocity
Stiffer media have _______ sound speeds.
Higher
Relation of acoustic impedance and refelction:
In substance with same Z, how much is the total transmission energy and is there any reflection?
Total transmission
There is no refelction
How to get the propagation speed of sound?
C= wavelength x frequency
The denser the medium = the ______ the propagation speed.
Lower
It indicates tge fractional decreasevin the volume when pressure is apploed to the material
Compressibility (K)
Relative measurement that compare value at one point to anoth er point. It is used to express a change in two values with same units.
Decibel
It is the property of a substance, which describes how the particles of that substance behave when subjected to a spund wave
Acoustic Impedance
Acoustc impedance is a product of?
Tissue density and speed of sound
Relation of acoustic impedance and refelction:
In substance with small difference of Z, how much is the transmission energy and is there any reflection?
There is a little energy reflected but most of the energy is transmitted.
It is the difference in acoustic impedance
Acoustic impedance mismatch
Relation of acoustic impedance and refelction:
In substance with large difference in Z, how much is the transmission energy and is there any reflection?
There is a large amount of reflection and a little energy that is trasmitted
It gives the proportion of energy reflected from an interface bet. two substances.
Intensity reflection Coefficient
It is the resistance of a material to compression.
Stiffness
