Midterm Review (ch 1-12 ultrasound physics)
Unrelated - Answer-Two items that are not associated
Directly related - Answer-Two items that are associated; when one increases, so does the other.
Units of length/distance - Answer-Cm, ft
Units of area - Answer-Cm squared, ft squared
Unit...
Midterm Review (ch 1-12 ultrasound
physics)
Unrelated - Answer-Two items that are not associated
Directly related - Answer-Two items that are associated; when one increases, so does the other.
Units of length/distance - Answer-Cm, ft
Units of area - Answer-Cm squared, ft squared
Units of volume - Answer-Cm (cubed), ft (cubed)
What is the reciprocal of 100? - Answer-1/100 OR 0.01
What is media? - Answer-Biological tissue
Compressed? - Answer-Squeezed together
Rarefied? - Answer-Stretched apart
Sound waves are what type of wave? - Answer-Longitudinal and acoustic
Transverse waves? - Answer-Particles that move perpendicular to the direction that the wave propagates.
Longitudinal waves? - Answer-Particles that move in the same direction that the wave propagates.
When can you call a wave a sound wave? - Answer-1. It is a mechanical wave,
2. It is longitudinal
3. One of the acoustic variables should be in rhythmic oscillation.
Acoustic propagation properties? - Answer-The effects of medium upon the sound wave.
Biological effects? - Answer-The effects of the sound wave upon the biological tissue through which it
passes.
What is ultrasound? - Answer-Inaudible sound over 20,000 Hz.
Three acoustic variables? - Answer-Pressure, density, and distance
Pressure unit? - Answer-Pascals
Density units? - Answer-Kg/cm (cubed)
In-phase? - Answer-When a pair of waves peaks occur at the same time and location.
Out-of-phase? - Answer-When a pair of waves peaks occur at different times.
Interference? - Answer-When multiple beams arrive at the same location and lose their individual
characteristics to form one single wave.
, Constructive interference? - Answer-When a pair of in-phase waves result in the formation of a single
wave of greater amplitude than either of its components.
Destructive Interference? - Answer-When a pair of out-of-phase waves results in the formation of a single
wave of lesser amplitude than at least of one its components.
Two waves are traveling in a medium and arrive at a location at the same time. What event takes place? -
Answer-Interference.
Period? - Answer-The time it takes a wave to complete one cycle.
Period units? - Answer-Microseconds.
Period is determined by? - Answer-Sound source only.
Frequency? - Answer-The number of particular events that occur in a specific duration of time.
Frequency units? - Answer-Per second (Hz)
Frequency is determined by? - Answer-Sound source only.
Is period adjustable? - Answer-No
Is frequency adjustable? - Answer-No.
Sound with frequencies so high that humans cannot hear it is called? - Answer-Ultrasonic / Ultrasound
Frequency is important in sonography because? - Answer-Affects penetration and image quality.
Infrasound frequency? - Answer-Less than 20 Hz
Audible sound frequency? - Answer-20 Hz - 20 kHz
Ultrasound frequency? - Answer-Greater than 20 kHz.
If the frequency of a sound wave is 2 Hz, what's it's period? - Answer-0.5 microseconds.
How are period and frequency related? - Answer-Inversely.
As frequency increases, period __? - Answer-Decreases.
Density formula? - Answer-Mass over volume
How are amplitude, power and intensity related? - Answer-Directly proportional.
Three "Bigness" parameters? - Answer-Amplitude, power, and intensity.
Amplitude definition? - Answer-The "bigness" of a wave.
Is amplitude adjustable? - Answer-Yes
Amplitude is determined by? - Answer-Sound source.
Power definition? - Answer-Rate of energy transfer or the rate at which work is performed.
Power units? - Answer-Watts.
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