In the Unit 10 Assignment, you will evaluate your readiness

1. Attenuateon is determined by which of the following factors? a. Density and stiffness of the medium b. Frequency of sound and propagation speed c. PRF of sound and path length d. Path length and frequency of sound 2. An acoustic wave is traveling through soft tissue, its intensity undergoes nine decibels of attenuateon. How does the final intensity of the wave relate to the intensity of the wave when it started its journey? a. It is now four times larger b. It is six times larger c. It is now one-fourth as large d. It is now one-eighth as large 3. A sound wave is created by a transducer. The imaging depth is 10 cm in soft tissue. What is the maximum pulse repetition frequency? a. 7,700 b. 7.7 KHz C. 10,000 Hz d. 100 Hz 4. A wave’s intensity is 3 mW/cm2 , there is a change of +6 dB, what is the final intensity? a. 12 mW/cm2 b. 9 mW/cm3 c. 18 mW/cm2 d. 6 mW/cm2 5. The following are right about Decibel notation except: a. Logarithmic b. A ratio c. Require one intensity d. Positive decibels report signals that are increasing in strength 6. A reduction in the intensity of a sound beam to one-fourth of its original value is dB a. + 6 dB b. – 6 dB C. – 9 dB 1. – 3 dB 7. If the frequency is decreased, penetration Increases b. Decreases c. Is doubled d. Remains constant 8. If the Frequency increases, the attenuateon a. Increases b. Decreases c. doubles

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