Question

a Doppler ultrasound machine can measure blood flow speeds, for instance, in a patient’s artery. The probe is illustrated below.

First, here are two questions about the Doppler effect:

1. When a listener is moving away a stationary source that emits a sound wave of frequency f, the listener will hear a sound of   ["smaller frequency", "the same frequency", "greater frequency"]          
2. When a source that emits a sound wave of frequency f moves away a stationary listener, the listener will hear a sound of ["smaller frequency", "the same frequency", "greater frequency"]      

Assume that the probe emits waves at a frequency of 6 MHz, the speed of the wave in tissue is 1540 m/s, and assume the blood cell is moving 30 cm/s away from the probe.

C. The frequency received by the blood cell when the cell is moving away from the probe at a speed of 30 cm/s is most nearly ["5.9988", "5.9964", "6.0036", "6.0023", "6.0012", "5.9976"]   MHz

D. The blood cell then reflects the sound wave back to the probe. The frequency received by the probe is most nearly                            [ Select ]                       ["6.0023", "6.0036", "5.9964", "5.9976", "6.0012", "5.9988"]           MHz

Answer 1

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