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# Physics Frequency

### Physics Frequency Quiz

What determines frequency? The thickness of the crystal
What is the frequency with a thin crystal? High
What is the frequency with a thick crystal? Low
What is the behavior of the frequency of a wave as it travels through different media? It remains unchanged
What is the relationship between period and frequency? Inverse
What is the relationship between wavelength and frequency? Inverse
What is the relationship between propagation speed and frequency? Unrelated (Wavelength & Velocity are related to propagation speed)
What is the effect of frequency on image quality? Direct - Higher frequency = better resolution
What is the effect of frequency on depth of penetration? Inverse - Higher frequency = less depth of imaging
What determines the period of an ultrasound wave? Wavelength frequency which is determined by the thickness of the crystal in the transducer
What is the formula for frequency? F = 1/T or F = V/wavelength
Define frequency - The number of particular events ( /cycles or pressure oscillations) that occurs in a specific duration of time;
Frequency is reported in what units? Units per second or hertz. (Hz)
How would you write 1,000 hertz? 1 kHz (Kilohertz)
How would you write 1,000,000 hertz? 1 MHz (megahertz)
What are the typical values of frequency used in clinical imaging? 1 MHz to 10 MHz or 1 million to 10 million per second
Frequency is determined by? Sound source not the medium through which the sound is traveling
How can the frequency be adjusted by the sonographer? By changing the tranducer (The thinner, the higher)
Define audible - Sounds that humans can hear (Sounds between 20 Hz and 20,000 Hz) (20,000 Hz = 20 kHz)
Define infrasonic - Sound waves below 20 Hz
What happens to period when frequency increases? Period decreases
What is the frequency of ultrasound? Greater than 20 kHz
What is the second, even more special, relationship between period and frequency? They are reciprocals
What does it mean when two parameters are reciprocals? When the two parameters are multiplied together, the answer is always 1
Example of the reciprocal relationship between period and frequency - If a wave takes 1/8 of a second to vibrate up & down the period is 1/8 & the frequency is 8 per second or 8 Hz
What is the fundamental measurement of velocity? Most common: 1.54 x 10 ^3 M/sec - Can use: 60 miles/min or 3600 mph
What is the range for perios (T)? 0.1 to 1 microsecond
What is the relationship between depth of penetration and frequency? Inverse
What is the relationship between rate of attenuation and frequency? Direct
What is the relationship between quality/spatial resolution and frequency? Direct
If given period, and you want to solve for frequency. What do you use? Period to Frequency - Use F = 1/T
If given frequency, and you want to solve for period. What do you use? Frequency to Period - Use T = 1/F
Given wavelength, and you want to solve for frequency. What do you use? Wavelength to Frequency - Use F = V/Wavelength
Given frequency, and you want to solve for wavelength. What do you use? Frequency to wavelength - Use Wavelength = V/F
Sound is what kind of wave? Mechanical & Longitudinal
Density, particle motion & pressure are considered examples of what? Acoustic variables
The effect of ultrasound upon tissue is called what? Bioeffects
The product of wavelength X frequency is what? Velocity
M/cycle X cycle/second = what? M/second
What happens to frequency when the period doubles? It halves
Created by: ct program