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Doppler ultrasound uses ultrasound to measure blood flow
velocity. Suppose that the device sends sound waves with a
frequency of (3.5MHz) and the speed of sound in human
tissues (1540m/s). What is the expected beat frequency if
blood flows in the large vessels in the leg at a speed of (cm/s2)
directly and away from the sound source?
0) 0.92MHZ
0) 920Hz
0) 92Hz
0) 9.2KHz
0) 9.2Hz

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