SPI Physics Board Review Exam Questions
And Answers
Metric notations: giga, mega, kilo, hecto, deca, deci, centi, milli,
micro, and nano -
correct answer ✅10 to the... Giga 9, mega 6, kilo 3, hecto 2, deca
1, deci -1, centi -2, milli -3, micro -6, nano -9
Complimentary metric units: what goes with giga? Mega? Hecto?
Deca? -
correct answer ✅Giga+nano
Mega+micro
Hecto+centi
Deca+deci
Sounds must travel though a (blank) it cant travel through a (blank)
-
correct answer ✅Medium, vacuum
Sounds is a (blank) wave -
correct answer ✅Mechanical, longitudinal
What are the three acoustic variables? What are their units? -
correct answer ✅1. Pressure: force/area, pascals
,SPI Physics Board Review Exam Questions
And Answers
2. Density: mass/volume, kg/cm3
3. Distance: cm, feet, miles
Transverse versus longitudinal wave -
correct answer ✅In a Transverse wave the particles move
perpendicular to the direction of the wave (think ocean waves).
In longitudinal waves the particles move in the same direction as
the wave (bunched up slinky).
Compressions versus rarefactions -
correct answer ✅Compressions are areas of increased pressure or
density whereas rarefactions are areas of decreased pressure or
density
Acoustic Parameters: what do these do? What are the 7 with
ultrasound? -
correct answer ✅Acoustic parameters describe the features of a
particular wave (whereas acoustic variables determine which waves
are sound waves). The 7 acoustic variables we are concerned about
with ultrasound are: period, frequency, amplitude, power, intensity,
speed and wavelength
,SPI Physics Board Review Exam Questions
And Answers
Acoustic parameters: Period
Definition, units, determined by source or medium, can
sonographer change it, relationships -
correct answer ✅The time required to complete a single cycle.
Units: seconds, microseconds, hours, any unit of time.
Determined by: sound source
Changed by sonographer: no
Relationships: period and frequency are reciprocals (inverse
relationship); when one goes up the other goes down.
Acoustic Parameters: Frequency
Definition, units, determined by source or medium, can
sonographer change it, typical values, relationships, what does freq
affect? -
correct answer ✅In DMU the frequency of a wave is the number
of cycles of an acoustic variable that occur in one second.
Units: per second, 1/second = Hertz (Hertz is per second, 1,000/sec
= kilohertz; 1,000,000/sec=megahertz).
Determined by sound source.
Changed by sonographer: no
Typical values 2 to 15 MHz
, SPI Physics Board Review Exam Questions
And Answers
Relationships: frequency and period are inversely related.
Frequency affects penetration and axial resolution (image quality)
Ultrasound is a wave with a frequency greater than (blank) Hertz -
correct answer ✅20,000 Hz, (20kHz)
Audible sound is between (blank) and (blank) Hz -
correct answer ✅20 and 20,000 Hz
Infrasound is sound with frequncies less than (blank) Hz -
correct answer ✅Less than 20 Hz
What time of relationship are period and frequency? What are their
equations? What are their complimentary units? -
correct answer ✅Period and frequency are reciprocals, having an
inverse relationship (as one goes up the other goes down);
period (sec)=1/freq (Hz)
Freq (Hz) = 1/period (sec)
Freq (Hz) x period (sec) = 1
Complimentary units: sec & Hz; microseconds and MHz
And Answers
Metric notations: giga, mega, kilo, hecto, deca, deci, centi, milli,
micro, and nano -
correct answer ✅10 to the... Giga 9, mega 6, kilo 3, hecto 2, deca
1, deci -1, centi -2, milli -3, micro -6, nano -9
Complimentary metric units: what goes with giga? Mega? Hecto?
Deca? -
correct answer ✅Giga+nano
Mega+micro
Hecto+centi
Deca+deci
Sounds must travel though a (blank) it cant travel through a (blank)
-
correct answer ✅Medium, vacuum
Sounds is a (blank) wave -
correct answer ✅Mechanical, longitudinal
What are the three acoustic variables? What are their units? -
correct answer ✅1. Pressure: force/area, pascals
,SPI Physics Board Review Exam Questions
And Answers
2. Density: mass/volume, kg/cm3
3. Distance: cm, feet, miles
Transverse versus longitudinal wave -
correct answer ✅In a Transverse wave the particles move
perpendicular to the direction of the wave (think ocean waves).
In longitudinal waves the particles move in the same direction as
the wave (bunched up slinky).
Compressions versus rarefactions -
correct answer ✅Compressions are areas of increased pressure or
density whereas rarefactions are areas of decreased pressure or
density
Acoustic Parameters: what do these do? What are the 7 with
ultrasound? -
correct answer ✅Acoustic parameters describe the features of a
particular wave (whereas acoustic variables determine which waves
are sound waves). The 7 acoustic variables we are concerned about
with ultrasound are: period, frequency, amplitude, power, intensity,
speed and wavelength
,SPI Physics Board Review Exam Questions
And Answers
Acoustic parameters: Period
Definition, units, determined by source or medium, can
sonographer change it, relationships -
correct answer ✅The time required to complete a single cycle.
Units: seconds, microseconds, hours, any unit of time.
Determined by: sound source
Changed by sonographer: no
Relationships: period and frequency are reciprocals (inverse
relationship); when one goes up the other goes down.
Acoustic Parameters: Frequency
Definition, units, determined by source or medium, can
sonographer change it, typical values, relationships, what does freq
affect? -
correct answer ✅In DMU the frequency of a wave is the number
of cycles of an acoustic variable that occur in one second.
Units: per second, 1/second = Hertz (Hertz is per second, 1,000/sec
= kilohertz; 1,000,000/sec=megahertz).
Determined by sound source.
Changed by sonographer: no
Typical values 2 to 15 MHz
, SPI Physics Board Review Exam Questions
And Answers
Relationships: frequency and period are inversely related.
Frequency affects penetration and axial resolution (image quality)
Ultrasound is a wave with a frequency greater than (blank) Hertz -
correct answer ✅20,000 Hz, (20kHz)
Audible sound is between (blank) and (blank) Hz -
correct answer ✅20 and 20,000 Hz
Infrasound is sound with frequncies less than (blank) Hz -
correct answer ✅Less than 20 Hz
What time of relationship are period and frequency? What are their
equations? What are their complimentary units? -
correct answer ✅Period and frequency are reciprocals, having an
inverse relationship (as one goes up the other goes down);
period (sec)=1/freq (Hz)
Freq (Hz) = 1/period (sec)
Freq (Hz) x period (sec) = 1
Complimentary units: sec & Hz; microseconds and MHz
