The Doppler shift of ultrasonic waves can measure the speed of blood in an artery.If the frequency of the stationary source is 100 kHz and the reflected sound has a Doppler shift of 200 Hz,what is the blood flow speed? (The speed of sound inside the body is 1 500 m/s. )
A) 1.0 m/s
B) 1.5 m/s
C) 2.2 m/s
D) 3.3 m/s
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