If the velocity of blood flow in the aorta is normally about 0.32 m/s, what beat frequency would you expect if 4.30-MHz ultrasound waves were directed along the flow and reflected from the red blood cells? Assume that the waves travel with a speed of 1.54 x 10^3 m/s.

The beat frequency is

Explanation:

From this question we are given that

                        The velocity blood flow  is  

                          The velocity of the wave is  

                       The frequency of the ultrasound is  

During the time it is been directed along flow the blood cell is moving away frequency of the ultrasound wave(f) hence we are going to employ the Doppler's effect to obtain the frequency

When the red blood cell  reflects the wave in this case the source of the wave is the blood cells and its frequency()  is moving away from the observer (blood cells) and this case the Doppler's effect is mathematically given as

The beat frequency is mathematically represented as