Ultrasound reflected from an oncoming bloodstream that is moving at 19.7 cm/s is

Question

Ultrasound reflected from an oncoming bloodstream that is moving at 19.7 cm/s is mixed with the original frequency of 6.53 MHz to produce beats. What is the beat frequency? (Use 1540 m/s as the speed of sound through human tissue.) 000835X How is the frequency detected by a moving observer related to the frequency transmitted by a stationary source? How is the frequency detected by a stationary observer related to the frequency transmitted by a moving source? How is the beat frequency from two sound sources related to the frequency of the two sources? Hz Additional Materials Reading

Explanation / Answer

observed frequency is

f = [(v+vo) / (v-vi) ] fo

= [(1540+0.197) / (1540-0.197) ] * (6.53*106)

= 6.53167*106

beat frequency = f-fo = 6.53167*106 - 6.53*106 = 1670.87 hz

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