A blood-flow meter emits a 1.1-MHz ultrasound pulse to measure the speed of blood moving directly...
A blood-flow meter emits a 1.1-MHz ultrasound pulse to measure the speed of blood moving directly away from the meter. The meter’s sensor detects the pulse reflected back from the blood at a frequency 21 Hz lower than the emitted frequency. Take the speed of sound in the tissues to be 1475 m/s.
At what speed, in centimeters per second, is the blood moving?
Homework Answers
Frequency, F = 2 f v/c
21 = 2 x 1.1 x 10^6 v/1475
Velocity, v = 1.41 cm/sec
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