Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
22 Cards in this Set
- Front
- Back
|
Definition of sound: |
The sensation produced by vibrations reaching the organs of hearing through gas, liquid, or solid medium. |
|
|
Can sound travel without a medium (in a vacuum)? |
No. Sound needs a medium (can be any material) to travel through. |
|
|
What type of wave is a sound wave? |
Mechanical and longitudinal. |
|
|
What does a wave transport? |
Energy. |
|
|
Compression |
An area of increased particle density. |
|
|
Rarefaction |
An area of decreased particle density. |
|
|
What is a mechanical wave? |
Travels through the medium by particle interaction. |
|
|
What is a longitudinal wave? |
The motion of the particles of the medium is parallel to the direction of the sound. |
|
|
Pressure |
Concentration of force |
|
|
Density |
Concentration of mass or weight |
|
|
Particle motion |
Measurement of distance |
|
|
Temperature |
Measurement of heat |
|
|
Units of pressure |
Pascals, lbs/sq. In., atmospheres |
|
|
Units of density |
Kilo per cubic cm |
|
|
Measurement in distance |
Meters, cm, feet |
|
|
Measurement of heat |
Degrees |
|
|
What is a typical Period in US? |
.77 - .15 microseconds |
|
|
Measurement of frequency |
Hertz |
|
|
Frequency |
The number of complete cycles that occur in one second of time |
|
|
The sonographer's choice of frequency affects: |
- Penetration - Image resolution |
|
|
Formula for frequency |
F = 1 / T |
|
|
Formula for period |
T = 1 / F |
