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Determine beat frequency from a ultrasound wave reflected in oncoming bloodstream

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Ultrasound reflected from an oncoming bloodstream that is moving at a 30 cm/s is mixed with the original frequency of 2.5 MHz to produce beats. What is the beat frequency? (Velocity of sound in blood = 1540 m/s.)
Beat frequency = in Hz

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First, you have to realize that since the waves are being reflected off of blood that is moving at 30 cm/s (.3 ...

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