試卷名稱:114年 - 114 台灣聯合大學系統_碩士班招生考試:普通物理#137733
年份:114年
科目:研究所、轉學考(插大)◆普通物理學
7. A doctor uses ultrasound to monitor blood flow in a patient's artery. The ultrasound device emits a 4.0 MHz wave, which reflects off moving red blood cells. The observed frequency shift due to the motion of the blood cells is 120 Hz. Assume the speed of sound in blood is approximately v =1540 m/s. Calculate the speed u of the blood cells.
(A) 1.53cm/s
(B) 2.31cm/s
(C) 3.12cm/s
(D) 4.97cm/s
(E) 5.73cm/s