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Study sets matching "physics 127 acoustics"

Physics acoustics
Sound is...
Sound propagates...
For the existence of sound it´s necess…
A cycle is...
a longitudinal and mechanical wave that transmits pressure vi…
through an elastic medium.
a sound source, a transmission medium and a receiver.
the distance traveled by the oscillating body between two poi…
Sound is...
a longitudinal and mechanical wave that transmits pressure vi…
Sound propagates...
through an elastic medium.
93 terms
Acoustical Physics
Decibels
Sound power level
Sound pressure level
0dB SPL =
Dimensionless quality used to compare the ratio of two quanti…
Sound at source measured in watts
Measures pressure deviations from equilibrium
20µPa
Decibels
Dimensionless quality used to compare the ratio of two quanti…
Sound power level
Sound at source measured in watts
11 terms
Physics- Acoustics
Acoustics
Types of Waves
Properties of all waves
Properties of sound waves
- a wave is a mechanism for the transfer of energy without th…
- Transverse; water, EM (electromagnetic) radiation ... - Longit…
- frequency: the number of vibrations per second or cycle... - w…
-all sound requires a medium through which travel ... - sound is…
Acoustics
- a wave is a mechanism for the transfer of energy without th…
Types of Waves
- Transverse; water, EM (electromagnetic) radiation ... - Longit…
42 terms
Acoustics: Physics
Physics
Every physical measurement consists of…
Distance
Area
the science of matter and energy and the interactions between…
a magnitude... a unit of measurement
(d) the length of the shortest line connecting two points. Ba…
(A) the amount of space occupied by a surface. Measured in m^2
Physics
the science of matter and energy and the interactions between…
Every physical measurement consists of…
a magnitude... a unit of measurement
10 terms
Physical Acoustics
Period (T)
Wavelength (lambda)
Elasticity (K)
Pressure (P)
T=1/f
lambda=c/f
f=K/M
P=F/A
Period (T)
T=1/f
Wavelength (lambda)
lambda=c/f
39 terms
PHYSICS OF ACOUSTICS
when an object changes position, it is…
when velocity changes
related to the difficulty of changing…
force (unit and formula)
displacement
acceleration
mass
mass x acceleration, newtons (N)
when an object changes position, it is…
displacement
when velocity changes
acceleration
56 terms
Physical Acoustics
Kinematics
Dynamics
Basic Physical Quantities
Derived Physical Quantities
...
...
...
...
Kinematics
...
Dynamics
...
72 terms
Physics 127
The time it takes the sun to orbit mil…
Thickness of the thin disk
Diameter of risk of the milkyway
Mass inside if the sun's orbit
220 million years
1000 light years
100,000 to 160,000 light years
9.0 x 10^10 solar masses
The time it takes the sun to orbit mil…
220 million years
Thickness of the thin disk
1000 light years
42 terms
Physical Acoustics
To vibrate, a source must have two pro…
Mass (m)
The Difference from Mass and Weight
Elasticity (E)
Mass (m) ... Elasticity (E)
-the amount of matter present ... -Applies to gases, liquids, an…
Weight is a gravitational force, whereas mass is the quantity…
property that enables recovery from distortion of shape or vo…
To vibrate, a source must have two pro…
Mass (m) ... Elasticity (E)
Mass (m)
-the amount of matter present ... -Applies to gases, liquids, an…
45 terms
Physical Acoustics
Mass (m) and Elasticity (E)
To transmit sound
Mass (m)
Elasticity (E)
What properties does a source need to vibrate?
A medium must be capable of being set into vibration.
- Amount of matter present... -Applies to gases, liquids, and s…
property that enables recovery from distortion of shape or vo…
Mass (m) and Elasticity (E)
What properties does a source need to vibrate?
To transmit sound
A medium must be capable of being set into vibration.
66 terms
Physical Acoustics
Kinematics
Dynamics
Basic Quantities
Derived Quantities
the study of sound as purely motion
cause and movement of sound
are the simplest quantities in that other quantities are deri…
come from basic quantities being summed/multiplied so on toge…
Kinematics
the study of sound as purely motion
Dynamics
cause and movement of sound
65 terms
Acoustical Physics
Transducer
Transmission
Reception
Piezoelectric or ferroelectric
Any device that converts one form of energy into another.
Electrical energy from the system is converted into sound.
The reflected sound pulse is converted into electricity.
Materials which converts out into electricity and vice versa…
Transducer
Any device that converts one form of energy into another.
Transmission
Electrical energy from the system is converted into sound.
51 terms
Acoustical Physics
Direct Relationship
Inverse Relationship
Unrelated
Related/ Proportional
When one increases/decreases, the other increases (decreases)…
When one increases, the other decreases (and vice versa) with…
Two items not associated.
Two items associated, but relationship does not have to be sp…
Direct Relationship
When one increases/decreases, the other increases (decreases)…
Inverse Relationship
When one increases, the other decreases (and vice versa) with…
45 terms
Acoustic Physics
coulomb
displacement
velocity
instantaneous speed
(electric charge) total charge of 6.24 X 10^18 electrons
changing position of object
magnitude and direction
speed measured at any instant of time
coulomb
(electric charge) total charge of 6.24 X 10^18 electrons
displacement
changing position of object
40 terms
Acoustical Physics
speed
velocity
acceleration
weight
distance travelled per unit of time
refers to both the speed and direction of the motion (a vecto…
change in velocity per unit of time
weight is the force of gravity
speed
distance travelled per unit of time
velocity
refers to both the speed and direction of the motion (a vecto…
51 terms
PHYSICS ACOUSTICS EXAM 2
Assume the other ear canal is a cylind…
Which of the following is NOT an effec…
The ossicles in the middle ear transmi…
In which part of the ear is the wave m…
2833
To transform the air vibrations to fluid vibrations in the in…
amplify the pressure from the outer ear.
The organ of Corti
Assume the other ear canal is a cylind…
2833
Which of the following is NOT an effec…
To transform the air vibrations to fluid vibrations in the in…
16 terms
Physics: Acoustics Concepts and Terminology
supersonic
sonic boom
frequency
whale
faster than the speed of sound
a deafening 'bang' sound that an aircraft makes when it cross…
the faster something vibrates, the higher the sound it makes.…
The loudest animal in the world, which makes sounds up to 188…
supersonic
faster than the speed of sound
sonic boom
a deafening 'bang' sound that an aircraft makes when it cross…
37 terms
Physics 127/ Chap 3
what are the 7 parameters which descri…
which parameters can be changed by the…
regarding sound waves, how are 'infras…
why is frequency important in sonograp…
Amplitude; Frequency; Intensity; Period; Power; Speed; Wavele…
amplitude, power and intensity
Infrasound: less than 20 Hz- inaudible... Audible sound: between…
it affects penetration and image quality.
what are the 7 parameters which descri…
Amplitude; Frequency; Intensity; Period; Power; Speed; Wavele…
which parameters can be changed by the…
amplitude, power and intensity
20 terms
Physics 127/ Chap 4
What are 5 parameters to describe Puls…
Describe Pulse Sound
Describe Pulse Duration
what is the typical value of pulse dur…
Duty Factor; Pulse Duration; Pulse repetition frequency; Puls…
A collection of cycles that travel together as a single unit;…
the actual time from start of a pulse to end of that pulse. T…
0.3 - 2.0 us (microseconds)
What are 5 parameters to describe Puls…
Duty Factor; Pulse Duration; Pulse repetition frequency; Puls…
Describe Pulse Sound
A collection of cycles that travel together as a single unit;…
49 terms
Physics 127 Constellation Quiz
Andromeda
Aquarius
Aquila
Aries
The Princess
The Water Bearer
The Eagle
The Ram
Andromeda
The Princess
Aquarius
The Water Bearer
34 terms
Acoustics Physics concepts
Amount of matter in an object
Force... Measured in Newton (Mks) or dyn…
Force of gravity on an object
Volume ... Measured in mL or L
Mass... ... Measured in g or kg
Any influence that causes an object to undergo a change in sp…
Weight... Measured in newton's or dynes
The 3D space occupied by a liquid, solid, or gas
Amount of matter in an object
Mass... ... Measured in g or kg
Force... Measured in Newton (Mks) or dyn…
Any influence that causes an object to undergo a change in sp…
135 terms
Test 1: Physical Acoustics
Sound
2 sound elements
Mechanical disturbance
Elastic medium
- A mechanical disturbance propagated through an elastic medi…
- Mechanical disturbance... - Elastic medium
- Displacement (x)... - Time (t)... - Kinematics: motion
- Mass (m)... - Elastic force... - Dynamics: the forces underlying…
Sound
- A mechanical disturbance propagated through an elastic medi…
2 sound elements
- Mechanical disturbance... - Elastic medium
55 terms
Acoustics Lecture 2: Physics
Distance (d)
Area (A)
Area of a rectangle
Area of a triangle
The length of the shortest line connecting two points.
The amount of space occupied by a SURFACE.... Recorded in square…
l x w
1/2 b x h
Distance (d)
The length of the shortest line connecting two points.
Area (A)
The amount of space occupied by a SURFACE.... Recorded in square…
133 terms
Physical Acoustics definitions- 202
Inertia
Elasticity
Peak to peak amplitude
instantaneous amplitude
-the tendency for any object to keep in the state it is in. -…
tendency of something to return to starting shape or position
max positive displacement in one period
displacement for a single point in time
Inertia
-the tendency for any object to keep in the state it is in. -…
Elasticity
tendency of something to return to starting shape or position
41 terms
Acoustics: The Physics of Sound
Some examples of Acoustical Matters:
Acoustical Matters Regarding Speech
A Sound...
Sound and Vibration
-The pattern of vibrations of a bowed or plucked violin strin…
-Sound patterns that define the consonants and vowels that ar…
1. Originates from a source ... 2. Travles (propagates) through…
-Sound is a form of vibration ... -Back and forth movements ... -…
Some examples of Acoustical Matters:
-The pattern of vibrations of a bowed or plucked violin strin…
Acoustical Matters Regarding Speech
-Sound patterns that define the consonants and vowels that ar…
71 terms
Topics in Physics: Acoustics of Sound
Acoustics
physical characteristics of sound
sound
equilibrium
characteristics of sound
frequency, intensity, spectrum
movement of a disturbance (vibration) through an elastic medi…
undisturbed medium (air)
Acoustics
characteristics of sound
physical characteristics of sound
frequency, intensity, spectrum
15 terms
Physics - Room Acoustics
each note arrives cleanly, crisply and…
all parts of the hall hear the sounds…
listeners should feel bathed in the so…
Freedom from echo - reflections must b…
clarity
uniformity
envelopment
smoothness
each note arrives cleanly, crisply and…
clarity
all parts of the hall hear the sounds…
uniformity
Test 1 (Acoustic Physics)
Imaging Accuracy
Internal and External
Axial Resolution
Longitudinal, Range, Radial, Depth (LA…
What is the most important part of diagnostic imaging?
Name two types of mechanical focusing:
Ability of the system to display two structures that are very…
Name 4 other names for Axial Resolution:
Imaging Accuracy
What is the most important part of diagnostic imaging?
Internal and External
Name two types of mechanical focusing:
96 terms
Physics 127 Test 2
Eratosthenes
Ptolemaic
Early Ideas were rooted in....
What early philosophers think the heav…
measured the size of the Earth by noticing the position of th…
had the geocentric model that included epicycles
religious and philosophical ideas.
1) perfect... 2) unchanging... 3) completely circular... 4) earth is t…
Eratosthenes
measured the size of the Earth by noticing the position of th…
Ptolemaic
had the geocentric model that included epicycles
10 terms
Physics 127/ Chap 9
what are The shape and various regions…
what are Phased arrays?
how are transducer diameter and focal…
how are frequency and focal depth rela…
1. FOCUS-Location where beam is narrowest.... 2. NEAR ZONE-AKA N…
adjustable focus systems.
Directly
Directly
what are The shape and various regions…
1. FOCUS-Location where beam is narrowest.... 2. NEAR ZONE-AKA N…
what are Phased arrays?
adjustable focus systems.
52 terms
Acoustical physics II
B. Alternator
B. Continuous wave
C. Pulsed wave, single crystal
A. Pulse wave, phase array
the following are components of an ultrasound system except:…
This type of pulser generates a constant electrical signal in…
This type of pulser generates a single electrical Spike, whic…
This type of pulser generates numerous electrical spikes, whi…
B. Alternator
the following are components of an ultrasound system except:…
B. Continuous wave
This type of pulser generates a constant electrical signal in…
55 terms
CSD 202: physical acoustics
Sound
Mechanical disturbance
Kinematics
Elastic medium
a mechanical disturbance propagated through an elastic medium
disturbance that causes molecules to vibrate in place and bum…
the study of sound as pure motion, taking only motion into ac…
something that wants to return to its original shape; ex. air…
Sound
a mechanical disturbance propagated through an elastic medium
Mechanical disturbance
disturbance that causes molecules to vibrate in place and bum…
40 terms
CSD 202 - Physical Acoustics
Sinusoid
Moments of sinusoidal motion
Modes
Superposition
Oscillatory motion corresponding to sound. Three parameters:…
displacement, velocity, acceleration
natural frequencies at which objects oscillate; unique to eac…
sum of oscillations. ALL complex sounds are a superposition o…
Sinusoid
Oscillatory motion corresponding to sound. Three parameters:…
Moments of sinusoidal motion
displacement, velocity, acceleration
11 terms
Physics Review - Acoustic Variables
Acoustic Variables
Pressure
Longitudinal Waves
Density
When sound travels through a medium, these variables apply...…
Variation in pressure as particles vibrate.... Pressure variatio…
Particles vibrate/travel in the same direction (parallel) to…
Mass of a medium per unit volume or concentration of matter (…
Acoustic Variables
When sound travels through a medium, these variables apply...…
Pressure
Variation in pressure as particles vibrate.... Pressure variatio…
100 terms
Acoustic Physics: Basic Mathematics
PEMDAS
Order of operations
Important exponents... 10s
Important exponents... 2s... 3s
Order of operations
Parentheses ... Exponents... Multiplication ... Division ... Addition ... Su…
10^2=100... 10^3=1000... 10^-2=.01... 10^-3=.001
2^2=4... 2^3=8... 2^4=16... 3^2=9... 3^3=27... 3^4=81
PEMDAS
Order of operations
Order of operations
Parentheses ... Exponents... Multiplication ... Division ... Addition ... Su…
134 terms
Physical Acoustics/Ferrand
Sound occurs when...
the disturbance that creates changes i…
The formula for pressure is...
random movement of molecules at extrem…
a disturbance creates changes in pressure in a gas, liquid, o…
movement
P=F/A (pressure, force, area)
Brownian motion
Sound occurs when...
a disturbance creates changes in pressure in a gas, liquid, o…
the disturbance that creates changes i…
movement
57 terms
Acoustical Physics Equations and terms
wavelength
density
propagation velocity (c)
amplitude
propagation velocity (m/sec)/frequency (cycles per sec) c/f
mass (kg)/volume (m3)
{square root} bulk modulus/density
max- mean... mean-min... max-min/2
wavelength
propagation velocity (m/sec)/frequency (cycles per sec) c/f
density
mass (kg)/volume (m3)
57 terms
Acoustical Physics Definitions
decibels
sound power level
Sound intensity level
sound pressure level
a dimensionless quality used to compare the ratio of two quan…
sound at a source
the measure of sound in space
measures pressure deviations from equilibrium
decibels
a dimensionless quality used to compare the ratio of two quan…
sound power level
sound at a source
40 terms
Physical Acoustics - Exam Review
Sinusoid
Moments of sinusoidal motion
Modes
Superposition
Oscillatory motion corresponding to sound. Contains frequency…
Displacement, Velocity, and Acceleration
Natural frequencies at which objects oscillate. Unique to eac…
Sum of sinusoids/oscillatory motion
Sinusoid
Oscillatory motion corresponding to sound. Contains frequency…
Moments of sinusoidal motion
Displacement, Velocity, and Acceleration
28 terms
Acoustical Physics- US Terms
Anechoic
A-Mode (Amplitude Modulation)
B-Mode (Brightness Modulation)
Attentuation
A structure that does not produce any internal echoes
A 1 dimensional display consisting of a horizontal baseline.…
A 2 dimensional display of US. A-mode spikes electronically c…
process by which sound energy is extracted by absorption, sca…
Anechoic
A structure that does not produce any internal echoes
A-Mode (Amplitude Modulation)
A 1 dimensional display consisting of a horizontal baseline.…
22 terms
Physical Acoustics - SLHS305
mass (m)
weight
elasticity
Newton's 1st law
the amount of matter present... applies to gases, liquids, and s…
gravitational force
property that enables recovery from distortion or shape or vo…
inertia - all bodies remain @ rest or in a state of uniform m…
mass (m)
the amount of matter present... applies to gases, liquids, and s…
weight
gravitational force
48 terms
Acoustical Physics FINAL Terms
Acoustics
Physics
Scalar
Vector
The study of the transmission and reception of energy in the…
The acoustic discipline concerned with the nature and propert…
Units that are only a magnitude, only whatever their value is…
A quantity having direction as well as magnitude, especially…
Acoustics
The study of the transmission and reception of energy in the…
Physics
The acoustic discipline concerned with the nature and propert…
45 terms
Physics Acoustic Test
medium
direction of propagation
transverse waves
crest and troughs
the stuff waves are vibrating
the direction a wave is moving
Waves where the vibrations are perpendicular to the direction…
peaks and valleys of waves
medium
the stuff waves are vibrating
direction of propagation
the direction a wave is moving
124 terms
Acoustic Physics: Exam 1
What are characteristics of a deep ima…
What are characteristics of a shallow…
What is the definition of DF?
What is the unit for DF?
low PRF, low DF, long PRP
high PRF, high DF, short PRP
percentage or time the system transmits a pulse
none
What are characteristics of a deep ima…
low PRF, low DF, long PRP
What are characteristics of a shallow…
high PRF, high DF, short PRP
67 terms
Acoustical Physics Final
Doppler Shift
Demodulation
Positive Doppler Shift
Negative Doppler Shift
Also known as doppler frequency. Relative motion (move closer…
The Doppler Shift is a low frequency that 'rides' on top of t…
When RBCs move toward the transducer, the doppler shift is po…
When RBCs move away from the transducer, the doppler shift is…
Doppler Shift
Also known as doppler frequency. Relative motion (move closer…
Demodulation
The Doppler Shift is a low frequency that 'rides' on top of t…
50 terms
Acoustical Physics Midterm
intensity of a wave is
if 100 newton forces moves a spring .0…
resonanace is the physical processs by…
for simple harmonic motion there must be
the power per unit area
...
energy
a restoring force and an equilibrium position
intensity of a wave is
the power per unit area
if 100 newton forces moves a spring .0…
...
33 terms
Physics 127/chap 15
of what are 'bistable' images composed?
what are the two user controls that ca…
What does 'contrast' determine?
What does 'Brightness' determine?
only 2 shades: black and white
Brightness and Contrast. On the monitor screen; not the keybo…
the range of brilliancies w/in the displayed image. This is a…
the brilliance of the displayed image.... This is a screen brigh…
of what are 'bistable' images composed?
only 2 shades: black and white
what are the two user controls that ca…
Brightness and Contrast. On the monitor screen; not the keybo…
20 terms
Physics 127/Chap 19
what is Doppler Frequency?
what is 'demodulation'?
what is the formula for Doppler shift?
when red blood cells move toward the t…
aka: doppler shift.... when the sound source and the receiver mo…
the process of extracting the low doppler freq from the trans…
DS (Hz) = reflected freq - transmitted freq.
Positive or Higher.
what is Doppler Frequency?
aka: doppler shift.... when the sound source and the receiver mo…
what is 'demodulation'?
the process of extracting the low doppler freq from the trans…
15 terms
PSYCS 127 The Physics of Stars
Spectroscopy
HR Diagram
Luminosity class Ia
Luminosity Class Ib
The study of the strengths of various spectral lines; used to…
Absolute magnitude, Spectral Type, Luminosity, and Temperature
Luminous Supergiants
Less Luminous Supergiants
Spectroscopy
The study of the strengths of various spectral lines; used to…
HR Diagram
Absolute magnitude, Spectral Type, Luminosity, and Temperature
17 terms
Physics 127/Chap.18
what is Pulse Inversion Harmonics?
what is power modulation harmonic imag…
what does 'Flow' indicate?
what is the unit of 'flow'?
only uses harmonic reflections, eliminating fundamental refle…
harmonics are extracted by sending one strong pulse and one w…
volume of blood moving during a particular time.
volume divided by time: liters/min.
what is Pulse Inversion Harmonics?
only uses harmonic reflections, eliminating fundamental refle…
what is power modulation harmonic imag…
harmonics are extracted by sending one strong pulse and one w…
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