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Carnegie physics
review for cumulative quarterly II
| Term | Definition |
|---|---|
| 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 |
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ICVT2b
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