Wave Behavior C.5 Doppler Effect (id: 58ff81fdb)

本题目来源于试卷: Wave Behavior C.5 Doppler Effect，类别为 IB物理学

[单选题]
Ultrasound incident on a moving blood cell reflected and received by a detector.


The frequency of an incident wave is $f$ and the measured frequency by the detector is $\prime f\prime$. The angle between the directions of the reflected wave and blood velocity $v$ is $\theta$. Which of the following quantities is $\prime f\prime$ dependent on?

A. $v$ only
B. $v$ and $f$ only
C. $\theta$ and $f$ only
D. $v$, $\theta$ and $f$


参考答案:  D


本题详细解析:

Explanation:

This is the method used for measuring the flow rate of blood by using the doppler effect. According to the doppler effect, the observed frequency is dependent on emitted frequency $f$, the component of speed $v$ towards the observer. Since the change in angle $\theta$ or $v$ may result in a change in the component of $v$ towards the observer, they both affect $\prime f\prime$.

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