Physics

Ultrasound reflected from an oncoming bloodstream that is moving at 30 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.)

Beat frequency = Hz

HELP: This problem involves two Doppler shifts.

HELP: In the first shift, the source is fixed and the observer is the moving blood. Why?

HELP: In the second shift, the source is the moving blood and the observer is fixed. Why?

HELP: It might be helpful to think of a tiny ultrasound recorder mounted on a blood cell. The recording happens when the ultrasound arrives at the cell, and the echo leaves when the recorded sound is "played back".

HELP: Once you know the frequency of the Doppler-shifted echo, how do you find the beat frequency between the echo and the original frequency?

  1. 👍 0
  2. 👎 0
  3. 👁 244
asked by Angel

Respond to this Question

First Name

Your Response

Similar Questions

  1. phy

    Doppler ultrasound is used to measure the speed of blood flow. If the speed of the red blood cells is v, the speed of sound in blood is u, the ultrasound source emits waves of frequency f, and we assume that the blood cells are

    asked by kira on April 12, 2013
  2. Physics

    A Doppler blood flow meter emits ultrasound at a frequency of 5.0 MHz. What is the beat frequency between the emitted waves and the waves reflected from blood cells moving away from the emitter at 0.15m/s? Assume that

    asked by N. on November 7, 2009
  3. Physics

    Blood flow rates in the umbilical cord can be found by measuring the Doppler shift of the ultrasound signal reflected by the red blood cells. If the source emits a frequency f, what is the measured reflected frequency fR? Assume

    asked by Becky on January 13, 2016
  4. Physics

    A diagnostic sonogram produces a picture of internal organs by passing ultrasound through the tissue. In one application, it is used to find the size, location, and shape of the prostate in preparation for surgery or other

    asked by Eric on November 2, 2019
  5. Physics

    On a supermarket parking lot, a car is pulling out and bumping into an oncoming car. The car pulls out with 0.8 m/s, while the oncoming car has a speed of 1.4 m/s. The angle between the velocities is 24 degrees, as indicated in

    asked by Holly J on September 20, 2010
  6. physics

    Dolphins can hear ultrasound with frequencies up to 280 kHz. What is the speed of sound in water if the wavelength of ultrasound with a frequency of 2.80 × 10^5 Hz is 0.510 cm? How long would it take this sound wave to travel to

    asked by sam on January 25, 2016
  7. algebra

    The function A(t) = 200e^-0.014t gives the amount of medication, in milligrams, in a patient's bloodstream t minutes after the medication has been injected into the patient's bloodstream. (a) Find the amount of medication, to the

    asked by Barb on November 17, 2014
  8. medical terminology

    A radiologist is able to evaluate the movement of body organs. What type of radiological procedure is being used? A. Ultrasound B. Fluoroscopic examination C. Magnetic resonance imaging D. Film Survey I'm assuming it's A.

    asked by Krystal on August 6, 2010
  9. College Algebra

    Show all work When a person has a cavity filled, the dentist typically administers a local anesthetic. After leaving the dentist's office, one's mouth often feels numb for several hours. If a shot of anesthesia is injected into

    asked by Rick on December 1, 2011
  10. verbs

    While he was biking this morning, Zach had seen a small accident. A huge SUV ran a red light, and the oncoming sedan was unable to stop. Driving on Portland's narrow streets was dangerous and expensive. the small dent in the sedan

    asked by Jim Collum on June 12, 2013

More Similar Questions