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Test Bank (Download Now) For Sonography Principles and Instruments 9th Edition by Kremkau ISBN: 9780323322713

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Test Bank (Download Now) For Sonography Principles and Instruments 9th Edition by Kremkau ISBN: 9780323322713

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Chapter 02: Ultrasound
Kremkau: Sonography Principles and Instruments, 9th Edition
MULTIPLE CHOICE
1. ________ is the amount of complete cycles per second.
a. Wavelength
b. Period
c. Frequency
d. Propagation speed
ANS: C
Frequency is defined as the number of complete cycles per second.
REF: p. 15 OBJ: Explain what frequency is and why it is important in sonography.
TOP: Basic ultrasound physics
2. Sound requires a ________ through which to travel.
a. medium
b. pressure
c. vacuum
d. wave
ANS: A
Sound travels (propagates) through a medium.
REF: p. 14 OBJ: Define ultrasound and describe how it behaves.
TOP: Basic ultrasound physics
3. The following are all ultrasound frequencies except:
a. 30,000 Hz
b. 250 kHz
c. 15 kHz
d. 0.3 MHz
ANS: C
Ultrasound frequencies range above 20,000 Hz (20 kHz).
REF: p. 16 OBJ: Define ultrasound and describe how it behaves.
TOP: Basic ultrasound physics
4. If frequency increases, each cycle (period) ________.
a. increases
b. decreases
c. remains unchanged
d. doubles
ANS: B
As more cycles are packed into one second (frequency), there is less time for each cycle
(period).