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 $′f′$. The angle between the directions of the reflected wave and blood velocity $v$ is $θ$. Which of the following quantities is $′f′$ dependent on?

A. $v$ only
B. $v$ and $f$ only
C. $θ$ and $f$ only
D. $v$, $θ$ 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 $θ$ or $v$ may result in a change in the component of $v$ towards the observer, they both affect $′f′$.

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