Physics Test #1 Chapter 2 Part 1
29 Questions
| Attempts: 55
Questions and Answers
- 1.
A wave is a traveling variation in quantities called?
- 2.
Sound is a traveling variation in quantities called?
- 3.
Ultrasound is a sound with a frequency greater than ________Hz
- 4.
Acoustic Variables include __________, __________, and __________ _________*3 Variables*
- A.
Wave
- B.
Pressure
- C.
Density
- D.
Particle Vibration
Correct Answer(s)
B. Pressure
C. Density
D. Particle VibrationExplanation
A Wave is a Traveling VariationRate this question:
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- 5.
Which of the following frequencies are in the Ultrasound Range?
- A.
15 Hz
- B.
15,000 Hz
- C.
15 MHz
- D.
30,000Hz
- E.
0.04 MHz
Correct Answer(s)
C. 15 MHz
D. 30,000Hz
E. 0.04 MHz -
- 6.
Which of the following are Acoustic Variables? ***More than one correct answer***
- A.
Pressure
- B.
Frequecy
- C.
Propagation Speed
- D.
Particle Motion
- E.
Period
Correct Answer(s)
A. Pressure
D. Particle Motion -
- 7.
Frequency is a measure of how many ______ an acoustic variable goes through in a second.
Correct Answer(s)
CyclesExplanation
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 unit of frequency is ______, which is abbreviated________
Correct Answer(s)
Hertz, Hz - 9.
Period is the ______ that it takes for one cycle to occur.
Correct Answer(s)
TimeExplanation
Time from the start of a cycle to the start of the next cycle *Period is determined by the Sound Source ONLY, not by the mediumRate this question:
- 10.
Period decreases as ____________ increases.
Correct Answer(s)
FrequencyExplanation
Period and frequency are INVERSELY RELATED to each otherRate this question:
- 11.
Wavelength is the length of ______ over which one cycle occurs
Correct Answer(s)
SpaceExplanation
Wavelength is the distance that a single cycle occupies spaceRate this question:
- 12.
Propagation Speed is the speed with which a ________ moves through a medium in 1 second.
Correct Answer(s)
Wave
Cycle
Wave or Cycle
Sound Wave - 13.
Wavelength is equal to _________ ________ divided by _________
Correct Answer(s)
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:
- 14.
The _________ and_________ of a medium determine Propagation Speed
Correct Answer(s)
Density, Stiffness
Stiffness, DensityExplanation
Stiffness (Hardness)is the resistance of a material to compression *Page 20 Kremkau*Rate this question:
- 15.
Propagation Speed Increases if ____________ is Increased.
Correct Answer(s)
Stiffness
Hardness
Stiffness or Hardness
Hardness or StiffnessExplanation
Page 22 KremkauRate this question:
- 16.
The average Propagation Speed in soft tissues is ?
- A.
1,540 m/s
- B.
1,540 mm/us
- C.
1.54 m/s
- D.
1.54 mm/us
Correct Answer(s)
A. 1,540 m/s
D. 1.54 mm/us -
- 17.
Propagation Speed is determined by
- A.
Frequency
- B.
Amplitude
- C.
Wavelength
- D.
Period
- E.
Medium
Correct Answer
E. 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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- 18.
The wavelength of 7-MHz ultrasound in soft tissue is __________mm
Correct Answer
0.22Explanation
***Wavelength ( __ ) = Speed (1.54mm/us) / Frequency (7-Mhz)
* 1.54 mm/us DIVIDED by 7Mhz = 0.22mmRate this question:
- 19.
Wavelength in Soft Tissue _________ as Frequency Increases
Correct Answer
DecreasesExplanation
***If Frequency INCREASES ***Wave Length DECREASES
***If Frequency DECREASES *** Wave Length INCREASESRate this question:
- 20.
It takes ________us for ultrasound to travel 1.54cm in Soft Tissue
Correct Answer
10Explanation
t = d / s
Speed of sound = 1.54 mm/us
Distance = 1.54cm **Convert to mm** 15mmRate this question:
- 21.
Propagation Speed in Bone is ______ than in Soft Tissue.
Correct Answer
Higher - 22.
Sound travels fastest in?
- A.
Air
- B.
Helium
- C.
Water
- D.
Steel
- E.
A Vacuum
Correct Answer
D. SteelExplanation
Fastest in SOLIDSRate this question:
-
- 23.
Solids have higher propagation speeds than liquids because they have greater
- A.
Density
- B.
Stiffness
Correct Answer
B. Stiffness -
- 24.
Sounds travels slowest in?
- A.
Gases
- B.
Steel
Correct Answer
A. Gases -
- 25.
Sound is a _____________wave *More than 1 correct answer*
- A.
Mechanical
- B.
Longitudinal
- C.
Compressional
Correct Answer(s)
A. Mechanical
B. Longitudinal
C. Compressional -
- 26.
If Frequency in Soft Tissue is Doubled, Propagation Speed is _________....
Correct Answer(s)
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:
- 27.
If Wavelength is 2mm and the frequency is Doubled the Wavelength becomes__________mm
Correct Answer(s)
1Explanation
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:
- 28.
From given values for propagation speed and frequency, which of the following can be calculated?
- A.
Amplitude
- B.
Impedance
- C.
Wavelength
- D.
Amplitude and Impedance
- E.
Impedance and Wavelength
Correct Answer
C. Wavelength -
- 29.
If two media have different stiffness, the one with the higher stiffness will have the higher propagation speed.
- A.
True
- B.
False
Correct Answer
A. TrueExplanation
Sound travels fastest in solids, slower in liquids, and slowest in gasesRate this question:
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Mar 21, 2022Quiz Edited by
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Dec 06, 2010Quiz Created by
KFeyler
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