The speed with which blood flows through an artery can be determined from the Doppler shift...
The speed with which blood flows through an artery can be determined from the Doppler shift in high-frequency sound waves sent into the artery and detected after reflection from the moving blood cells. What is done is to aim the source and receiver of the sound so that the reflections occur from cells moving away from them. Thus, the sound waves striking a cell are Doppler shifted because of its motion away from the source, and the waves that reach the receiver are further shifted because they come from a reflector moving away from it. Find the blood speed when the source frequency is 1MHz (=106 Hz) and the Doppler shift is 40 Hz.
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The speed with which blood flows through an artery can be
determined from the Doppler shift...
A Doppler ultrasound is used to measure blood flow speeds, for instance, in a patient's artery....
A Doppler ultrasound is used to measure blood flow speeds, for instance, in a patient's artery. Assume the probe emits ultrasound waves at a frequency of 5 x 1O^6 Hz and the speed of sound in human tissue is 1540 m/s. (a) Why is the Doppler effect the basis of the mechanism of an ultrasound machine? (b) What is the frequency, f" received by the probe if the beat frequency, that is, the frequency shift following reflection, is 400 Hz...
A red blood cell travels at speed 0.40 m/s in a large artery. A sound frequency...
A red blood cell travels at speed 0.40 m/s in a large artery. A sound frequency 2.00*10^6 Hz enters the blood opposite the direction of flow. a) Determine the frequency of sound reflected from the cell and detected by a reciever. b) If the emitted and received sounds are combined in the receiver, what beat frequnecy is measured?
A doppler blood flow meter emits ultrasound at a frequency of 5.0 MHz. The speed of...
A doppler blood flow meter emits ultrasound at a frequency of 5.0 MHz. The speed of sound in human tissue is 1540 m/s. The blood is moving at 0.15 m/s. A. What is the frequency shift do to the motion of the blood (Ch. 15)? B. What is the frequency of the waves reflected off the blood? C. What is the beat frequency of the interference between the emitted and reflected waves?
Hint Mary sings a note with a frequency of 888 Hz as she runs toward a...
Hint Mary sings a note with a frequency of 888 Hz as she runs toward a wall at a speed of 4.17 m/s. What is the beat frequency between the note she sings and its Doppler-shifted reflection from the wall? In other words, what beat frequency does Mary detect between hearing the sound of her voice directly and hearing the sound reflected from the wall? Mary detects two frequencies. One is the frequency of her voice. The other is the...
Police radar determines the speed of motor vehicles using the same Doppler-shift technique employed for ultrasound...
Police radar determines the speed of motor vehicles using the same Doppler-shift technique employed for ultrasound in medical diagnostics. Beats are produced by mixing the double Doppler-shifted echo with the original frequency. If 2.25 ✕ 1010 Hz microwaves are used and a beat frequency of 2,400 Hz is produced, what is the speed (in m/s) of the vehicle? (Assume the same Doppler-shift formulas are valid with the speed of sound replaced by the speed of light.)
A Doppler blood flow unit emits ultrasound at 4.0 MHz . What is the frequency shift...
A Doppler blood flow unit emits ultrasound at 4.0 MHz . What is the frequency shift of the ultrasound reflected from blood moving in an artery at a speed of 0.18 m/s ? need deltaf
We know from experience that the Doppler shift of sound from a moving car is easily...
We know from experience that the Doppler shift of sound from a moving car is easily detectable. Assuming light with a frequency of 1×1014 Hz, calculate the Doppler shift (the difference of the observed and emitted frequencies) for light from a car moving toward you at a speed of 170 m/s.
We know from experience that the Doppler shift of sound from a moving car is easily...
We know from experience that the Doppler shift of sound from a moving car is easily detectable. Assuming light with a frequency of 10×1014 Hz, calculate the Doppler shift (the difference of the observed and emitted frequencies) for light from a car moving toward you at a speed of 150 m/s.
We know from experience that the Doppler shift of sound from a moving car is easily...
We know from experience that the Doppler shift of sound from a moving car is easily detectable. Assuming light with a frequency of 5×1014 Hz, calculate the Doppler shift (the difference of the observed and emitted frequencies) for light from a car moving toward you at a speed of 140 m/s.
A Doppler flow meter uses ultrasound waves to measure blood-flow speeds. Suppose the device emits sound...
A Doppler flow meter uses ultrasound waves to measure blood-flow speeds. Suppose the device emits sound at 3.9MHz , and the speed of sound in human tissue is about 1540 m/s. What is the expected beat frequency if blood is flowing in large leg arteries at 3.0 cm/s directly away from the sound source?
A Doppler ultrasound is used to measure blood flow speeds, for instance, in a patient's artery. Assume the probe emits ultrasound waves at a frequency of 5 x 1O^6 Hz and the speed of sound in human tissue is 1540 m/s. (a) Why is the Doppler effect the basis of the mechanism of an ultrasound machine? (b) What is the frequency, f" received by the probe if the beat frequency, that is, the frequency shift following reflection, is 400 Hz...
Hint Mary sings a note with a frequency of 888 Hz as she runs toward a wall at a speed of 4.17 m/s. What is the beat frequency between the note she sings and its Doppler-shifted reflection from the wall? In other words, what beat frequency does Mary detect between hearing the sound of her voice directly and hearing the sound reflected from the wall? Mary detects two frequencies. One is the frequency of her voice. The other is the...
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