To Explain: The way ultrasound can be used to measure the speed of blood flowing in veins.
Explanation of Solution
Introduction:
Ultrasound can measure the speed of blood flowing in veins by using the Doppler effect. Doppler effect refers to the difference in the apparent frequency and source frequency when there is relative motion between source and observer.
The red blood cells reflect back the ultra sound waves and the shift in the frequency is measured using doppler effect which gives the measure of speed of blood flow.
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