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ARDMS SPI EXAM 2 LATEST VERSIONS
(VERSION A AND B) COMPLETE 200
QUESTIONS AND CORRECT ANSWER;
DETAILED ANSWERS (VERIFIED ANSWERS)
|ALREADY GRADED A+
What is the effect on the wavelength if the frequency is doubled?
- Halved
- Doubled
- Tripled
- No Change
CORRECT ANSWER; A) Halved
Ultrasound is defined as frequency greater than:
- 20 Hz
- 2 Hz
- 20 kHz
- 2 MHz
CORRECT ANSWER; C) 20 kHz
Rarefaction zone is defined as:
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- Low pressure
- # of cycles per second
- High pressure
- Small molecular particles
CORRECT ANSWER; A) Low pressure region
A decrease of 3 dB is equivalent to what change in intensity?
- Doubled
- Quartered
- Quadrupled
- Halved
CORRECT ANSWER; D) Halved
The unit used to express the measurement of relative intensity is which of the following?
- Watts
- Decibels
- Watts/cm^2
- Pascals
CORRECT ANSWER; B) Decibels
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Decreasing the overall gain from 30 dB to 27 dB will have what affect on the intensity of the echoes?
- Halved
- Quartered
- Increase by a factor of 1,000
- Doubled
CORRECT ANSWER; A) Halved
An ultrasound beam's intensity can be determined by measuring
the pressure amplitude using a:
- Microphone
- Geiger Counter
- Piezoelectric Transducer
- Hydrophone
CORRECT ANSWER; D) Hydrophone
Infrasound is defined as frequency less than:
- 20 Hz
- 20 MHz
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- 20,000 Hz
- 20 kHz
CORRECT ANSWER; A) 20 Hz
Frequency is defined as:
- Small molecular particles
- # of cycles per second
- Speed of sound in a medium
- Length of one cycle
CORRECT ANSWER; B) # of cycles per second
Frequency is changed from 8 MHz to 6 MHz, what will happen to the wavelength?
- Decrease
- Stay the same
- Increase
- Double
CORRECT ANSWER; C) Increase
What will be realized with a longer wavelength?