本题目来源于试卷: SoundSoundSoundSound，类别为 IB物理学
[问答题]
If a wind is blowing, will taim c3)o+d0x nhis pkc;i b1o) :(h/zr x6cc2ftjdalter the frequency of the sound heard by a person at rest with respect to the source? Is the wavelength or x b)2 c1k /phcztc:;i6 o(rjfdvelocity changed?
参考答案:
If the wind is blowing but the listener is at
rest with respect to the source, the listener will not hear a Doppler
effect. We analyze the case of the wind
blowing from the source towards the listener.
The moving air (wind) has the same effect as if the speed of sound had
been increased by an amount equal to the wind speed. The wavelength of the sound waves (distance
that a wave travels during one period of time) will be increased by the same percentage
that the wind speed is relative to the still-air speed of sound. Since the frequency is the speed divided by
the wavelength, the frequency does not change, and so there is no Doppler
effect to hear. Alternatively, the wind
has the same effect as if the air were not moving but the source and listener
were moving at the same speed in the same direction. See question 15 for a discussion of that
situation.
本题详细解析:
暂无
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