A doctor is trying to find out if their patient is experiencing blood clots, and decides to use a 62.3 kHz ultrasound wave aimed at the blood vessels moving towards the machine. If the patient is healthy, and their blood flows at the average speed of 5.41 km/h, what change in frequency would the doctor expect between the original wave and the returning wave? [Units: Hz] Note: the speed of ultrasound waves in blood is 5400.0km/h.

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