What is the blood beat frequency?

[confused1]

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 =

 

[OlderDan]

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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[bahamut]

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.)

It is called what what effect(I don't know how to say it in english)

The frequency the blood receive isf1=f(sound)*(V(sound)+V(blood))/V(sound)

The frequency blood reflect and mixed with the original Ultrasound is
f2=f1*V(sound)/( (V(sound)-V(blood))

So f2=f(sound)*(V(sound)+V(blood))/(V(sound)-V(blood)) ,you caculate it yourself.

And the f(beat)=|f2-f(sound)|.

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