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# Carnegie physics

### review for cumulative quarterly II

TermDefinition
The normal range of periods in cardiac echo is .1 to 1 microsecond
What is the advantage of using waves with very long periods? Better depth of penetration
The sound waves with the shortest periods are: ultrasound
Mm Wavelength
Microsecond T
MHz F
M/sec V
In comparing to sound waves, if the velocity is the same for both, then the wave with a short period will have a: Short wavelength
As sound passes through the body, which of the following remains constant? Period
True or false: then crystals produce waves with short periods true
True or falsev period is directly related to frequency False
True or false: period decreases steadily as sound travels through the body False
True: False :Waves with long periods produce better quality images False
How is it possible to change the period of a wave during a diagnostic medical ultrasound procedure? Change to a transducer with a different crystal thickness
If the period of a sound wave is measured in microseconds, then its complementary unit in frequency will be in Megahertz
The reciprocal of period is Frequency
List the period of a wave whose frequency is 5 megahertz 0.2 microsecond
If the period of a sound wave is .1 microseconds at a penetration depth of 5 millimeters, than the period at 10 millimeters is .1 microsecond
A transducer with a period of 0.5 microsecond has a wavelength of .77mm
High resolution is produced by ultrasound waves with Short periods
A wavelength of 0.6 millimeters would have what period? 0.39 microsecond
If the frequency of wave a is 10 times the frequency of wave B then the period of wave is blank the period of wave B 1/10; one tenth
The period Of an ultrasound wave is determined by the Crystal
Name the frequency of a wave whose. Is 0.4 times 10 to the negative 6 seconds 2.5 megahertz
What is not an acceptable unit for period? M/s
What are acceptable units for period? Seconds per cycle milliseconds per cycle microseconds per cycle nano seconds per cycle
Comparing to a 1 megahertz wave with the two megahertz wave, what is true? Period of the two megahertz wave is half as long as the period Of the one megahertz wave
If a sound wave travels through a medium with a faster speed, its period: Remains the same
The area of highest density in a sound wave occurs during The compression phase
The unit meters per cycle describes a sound waves Wavelength
The inverse of frequency is Period
0.1 to 1 microseconds is a range of an ultrasound waves Period
The device in which the piezo electric crystal is located is the Transistor
Amplitude cannot be determined using known variables for: Velocity, wavelength, period, frequency
Piezo-electric crystal thicknesses range from 0.1 to 1 millimeter. The 0.1 millimeter crystal would give the Highest frequency
Using high frequency ultrasound compared to low frequency results in Better resolution
If a wavelength equals 0.9 millimeters, find the frequency 1.7 megahertz
If frequency equals 10 megahertz, find the period 0.1 microseconds
If wavelength equals 0.4 millimeters, find the period. 0.26 microseconds
If the period Equals 0.4 microseconds, find the wavelength. .62 mm
If the. Equals 0.3 microseconds, find the frequency 3.3 megahertz
Two similar waves that intersect and result in a larger waves are an example of Constructive interference
Two waves of ultrasound arrive at the same location and interfere. The amplitude of the resulting wave is smaller than either of the two original waves therefore the : Two waves were out of phase
A longitudinal wave is characterized by: Particle motion occurring in the same direction as the propagation of the wave
The difference between audible sound waves and ultrasound waves is that Ultrasound has a higher frequency than audible sound
If a period of wave X is 5 microseconds and the period Of wave Y is one microsecond, then the frequency of wave x is ___________the frequency of wave y 1/5, one fifth
Without changing transducers, which of the following parameters can a sonographer Adjust? Amplitude of the wave
A wavelength is measured as Distance of 1 compression and one rarefaction phase
An acoustic variable is measured as 900 kg/m^3. That what is this variable? Density
Rarefaction is the: Low-energy phase of a cycle
If the frequency of 1 wave is double that of another wave, then its period is __________ the period Of the second wave. Half
If a wave travels from soft tissue to bone its frequency is Unchanged
If the velocity of a wave is doubled, then the wavelength is Doubled
Created by: ICVT2b

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