Question
One use of the Doppler effect in the medical field is the determination of the rate of blood flow in the human body. An ultrasonic
One use of the Doppler effect in the medical field is the determination of the rate of blood flow in the human body. An ultrasonic wave detector (transmitter and receiver) is installed in certain parts of the body that have blood vessels. The waves emitted by the detector, reach the blood cells, and are reflected by the red blood cells in the blood that are moving toward the wave detector. If the frequency of the waves from the source is f, the rate of ultrasound waves in body tissues is v, and the rate of blood flow is x, determine:
a. frequency of waves received by blood cells
b. the frequency of the reflected wave that reaches the detector
c. frequency of drift in the detector
d. Answer c, if f = 500 kHz, v = 1500 m/s, and x = 10 m/s
Satu pemanfaatan efek Doppler di bidang medis adalah penentuan laju aliran darah dalam tubuh manusia. Suatu detektor gelombang ultra sonik ( pemancar sekaligus penerima ) dipasang di bagian tertentu dari tubuh yang ada pembuluh darahnya. Gelombang dipancarkan detektor, sampai ke sel| darah, lalu dipantulkan oleh sel darah merah dalam darah yang sedang bergerak mendekati detektor gelombang. Jika frekuensi gelombang dari sumber adalah f, laju gelombang ultra sonik dalam jaringan tubuh adalah v, laju aliran darah adalah x, tentukan : a. frekuensi gelombang yang diterima sel darah b. frekuensi gelombang pantulan yang sampai kembali ke detektor c. frekuensi pelayangan dalam detektor d. Jawaban c, jikaf = 500 kHz, v = 1500 m/s, dan x = 10 m/s
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