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