The velocity of blood flow in an artery can be measured using Doppler shifted ultrasound. Suppose sound with frequency 1.5 × 10 6 Hz is reflected straight back by blood flowing at 1 m/s. Assuming the velocity of sound in tissue is 1500 m/s and that the sound is incident at a very small angle as shown in Fig., calculate the frequency shift between the incident and reflected wave
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As the sound is incident at a very small angle, the blood can be considered to be flowing directly away. Then the results of Problem 7 can be applied with v replaced by -v.
The frequency shift is then
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