Wave Behavior C.5 Doppler Effect (id: 651f3931a)

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

[单选题]
A traveling source produces sound waves nearby a child. The wavefronts of the sound waves and the position of a child are seen in the figure below.


The frequency of the generated sound waves is f. Which of the following is correct for both the direction of motion of the source and the observed frequency of the sound waves by the child?

A. The direction of the motion is Toward the child ; Observed frequency is Less than f
B. The direction of the motion is Toward the child ; Observed frequency is More than f
C. The direction of the motion is Away from the child ; Observed frequency is Less than f
D. The direction of the motion is Away from the child ; Observed frequency is More than f


参考答案:  C


本题详细解析:
Explanation:

The distance between wavefronts is equal to the wavelength. Since the wavefronts towards the child are more separated than wavefronts in the other direction, the child will receive wavefronts less frequently. Therefore, the child hears the sound with less frequency than $�$. The observed frequency is less than the frequency of the wave created by the source when the source and observer are receding from each other.

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