Physics Test #1 Chapter 2 Part 1
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Period is the ______ that it takes for one cycle to occur.
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- 2.
Period decreases as ____________ increases.
Explanation
Period and frequency are INVERSELY RELATED to each otherRate this question:
- 3.
Propagation Speed is the speed with which a ________ moves through a medium in 1 second.
- 4.
Wavelength in Soft Tissue _________ as Frequency Increases
Explanation
***If Frequency INCREASES ***Wave Length DECREASES
***If Frequency DECREASES *** Wave Length INCREASESRate this question:
- 5.
It takes ________us for ultrasound to travel 1.54cm in Soft Tissue
Explanation
t = d / s
Speed of sound = 1.54 mm/us
Distance = 1.54cm **Convert to mm** 15mmRate this question:
- 6.
Ultrasound is a sound with a frequency greater than ________Hz
- 7.
Frequency is a measure of how many ______ an acoustic variable goes through in a second.
Explanation
Frequency is reported in units of per second , 1/Sec, Hertz, or Hz. Hertz is another way to say "Per Second"Rate this question:
- 8.
The wavelength of 7-MHz ultrasound in soft tissue is __________mm
Explanation
***Wavelength ( __ ) = Speed (1.54mm/us) / Frequency (7-Mhz)
* 1.54 mm/us DIVIDED by 7Mhz = 0.22mmRate this question:
- 9.
If Wavelength is 2mm and the frequency is Doubled the Wavelength becomes__________mm
Explanation
As long as a wave remains in one medium, wavelength and frequency are inversely related. As frequency increases, wavelength decreases. The lower the frequency, the longer the wavelength. **Example** If a wave's frequency is twice that of another, the wavelength will be HALF as much
*Edelman PG. 33*Rate this question:
- 10.
Sound is a traveling variation in quantities called?
- 11.
If two media have different stiffness, the one with the higher stiffness will have the higher propagation speed.
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True
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False
Correct Answer
A. TrueExplanation
Sound travels fastest in solids, slower in liquids, and slowest in gasesRate this question:
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- 12.
The unit of frequency is ______, which is abbreviated________
Correct Answer
Hertz, Hz - 13.
Wavelength is the length of ______ over which one cycle occurs
Correct Answer
SpaceExplanation
Wavelength is the distance that a single cycle occupies spaceRate this question:
- 14.
Propagation Speed Increases if ____________ is Increased.
Correct Answer
Stiffness
Hardness
Stiffness or Hardness
Hardness or StiffnessExplanation
Page 22 KremkauRate this question:
- 15.
Wavelength is equal to _________ ________ divided by _________
Correct Answer
Propagation Speed, FrequencyExplanation
The relationship between the three is that wavelength is equal to Propagation speed (1,540 m/s or 1.54mm/us) divided by frequency. **This equation predicts that wavelength decreases as frequency increases **Page 19 & 20 in Kremkau**Rate this question:
- 16.
If Frequency in Soft Tissue is Doubled, Propagation Speed is _________....
Correct Answer
UnchangedExplanation
Propagation Speed is determined ONLY by the medium through which the sound is traveling.
Frequency of a sound wave is determined by the SOUND SOURCE only, not by the MEDIUM through which the sound is travelingRate this question:
- 17.
Acoustic Variables include __________, __________, and __________ _________*3 Variables*
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Wave
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Pressure
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Density
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Particle Vibration
Correct Answer(s)
A. Pressure
A. Density
A. Particle VibrationExplanation
A Wave is a Traveling VariationRate this question:
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- 18.
Propagation Speed is determined by
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Frequency
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Amplitude
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Wavelength
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Period
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Medium
Correct Answer
A. MediumExplanation
Speed is determined only by the medium through which the sound is traveling **Propagation Speed is the speed of sound through a medium**Rate this question:
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- 19.
Propagation Speed in Bone is ______ than in Soft Tissue.
Correct Answer
Higher - 20.
A wave is a traveling variation in quantities called?
Correct Answer
Wave Variables - 21.
Sounds travels slowest in?
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Gases
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Steel
Correct Answer
A. Gases -
- 22.
Solids have higher propagation speeds than liquids because they have greater
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Density
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Stiffness
Correct Answer
A. Stiffness -
- 23.
The _________ and_________ of a medium determine Propagation Speed
Correct Answer
Density, Stiffness
Stiffness, DensityExplanation
Stiffness (Hardness)is the resistance of a material to compression *Page 20 Kremkau*Rate this question:
- 24.
Sound travels fastest in?
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Air
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Helium
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Water
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Steel
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A Vacuum
Correct Answer
A. SteelExplanation
Fastest in SOLIDSRate this question:
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- 25.
From given values for propagation speed and frequency, which of the following can be calculated?
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Amplitude
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Impedance
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Wavelength
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Amplitude and Impedance
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Impedance and Wavelength
Correct Answer
A. Wavelength -
- 26.
Which of the following are Acoustic Variables? ***More than one correct answer***
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Pressure
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Frequecy
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Propagation Speed
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Particle Motion
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Period
Correct Answer(s)
A. Pressure
A. Particle Motion -
- 27.
The average Propagation Speed in soft tissues is ?
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1,540 m/s
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1,540 mm/us
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1.54 m/s
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1.54 mm/us
Correct Answer(s)
A. 1,540 m/s
A. 1.54 mm/us -
- 28.
Sound is a _____________wave *More than 1 correct answer*
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Mechanical
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Longitudinal
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Compressional
Correct Answer(s)
A. Mechanical
A. Longitudinal
A. Compressional -
- 29.
Which of the following frequencies are in the Ultrasound Range?
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15 Hz
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15,000 Hz
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15 MHz
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30,000Hz
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0.04 MHz
Correct Answer(s)
A. 15 MHz
A. 30,000Hz
A. 0.04 MHz -
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Mar 21, 2022Quiz Edited by
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Dec 06, 2010Quiz Created by
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