Doppler ultrasound is based on the shift of frequency in an ultrasound wave caused by a moving reflector, such as blood cells in the vasculature. Suppose that a stationary transducer (both speaker and microphone) directs ultrasounds of frequency 5 MHz toward a wall of blood cells ("Roll Tide!") moving toward the transducer with a speed of 0.50 m/s. The speed of sound in blood is assumed to be similar to water Vsound = 1500 m/s. I) Treat the blood moving toward the source as a moving observer (with positive velocity) and apply the Doppler shift equation to find the frequency of the ultrasound observed by the moving blood wall. (see Eq. 16-8 and keep lots of sig. figs.!) Hz foi = fal ¹+ 1
Doppler ultrasound is based on the shift of frequency in an ultrasound wave caused by a moving reflector, such as blood cells in the vasculature. Suppose that a stationary transducer (both speaker and microphone) directs ultrasounds of frequency 5 MHz toward a wall of blood cells ("Roll Tide!") moving toward the transducer with a speed of 0.50 m/s. The speed of sound in blood is assumed to be similar to water Vsound = 1500 m/s. I) Treat the blood moving toward the source as a moving observer (with positive velocity) and apply the Doppler shift equation to find the frequency of the ultrasound observed by the moving blood wall. (see Eq. 16-8 and keep lots of sig. figs.!) Hz foi = fal ¹+ 1
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