Calculating Beat Frequency in Ultrasound Reflection from Moving Bloodstream

AI Thread Summary
To calculate the beat frequency from ultrasound reflected off a moving bloodstream, first determine the Doppler-shifted frequency using the formula for the observed frequency based on the source and observer velocities. The original frequency is 1.3 MHz, and the bloodstream moves at 38 cm/s, with the speed of sound in blood being 1540 m/s. The observer's frequency can be calculated using the provided equations, resulting in a frequency that can then be subtracted from the original frequency to find the beat frequency. The discussion highlights the need to correctly apply the Doppler effect equations to solve for the reflected frequency before calculating the beat frequency. Accurate calculations will yield the final beat frequency.
cyberdx16
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Homework Statement



Ultrasound reflected from an oncoming bloodstream that is moving at 38 cm/s is mixed with the original frequency of 1.3 MHz to produce beats. What is the beat frequency? (Velocity of sound in blood = 1540 m/s.)


Homework Equations



Fo=Fs(v+Vo/v)
Fb- (F2-f1)

The Attempt at a Solution



idk where to start...
 
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you are given the original freq... need to work out the reflected freq first... which would be doppler shifted due to moving source... I think you have got your two relevant equations written down.
 
so Fobserver is 1300000Hz, Vsource is .38m/s, and Vobserver is 1540 m/s?

so i would do 1300000=Fsource (345 + 1540/345-.38)

take this # and subtrack by 1300000?
 

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