11.An ultrasound transducer is used to direct longitudinal waves at a frequency of 12MHz at an artery . The waves reflecting back to the transducer at an angle of 340 to the direction of blood flow. The blood cells are moving at a speed of 0.31ms-1 in the artery, and the speed of sound in the area is 1550ms-1. Calculate the change in frequency of the wave you would expect to see due to the Doppler effect.
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