試卷名稱:115年 - [無官方正解]115 國立臺灣大學_碩士班招生考試:普通物理學#137725
年份:115年
科目:研究所、轉學考(插大)◆普通物理學
7. A diagnostic ultrasound-echo is reflected from the moving away blood and returns with a frequency 500Hz lower than its original 2.0MHz. The speed (in unit of m/s) of the blood is about? The ultrasound speed is the same as sound speed which is~1600 m/s in blood.
(A) 0.2
(B) 0.02
(C) 0.002
(D) 0.0002
(E) 0.00002