本题目来源于试卷: gc textbook chapter 11 Vibrations and Waves，类别为 通用国际物理
[问答题]
Is the frequency of a simple periodic wave equal to the frequency of im7n2 i ekg8d1pts s-bntvr 1e /*.ahu,dkm ource? Why or why n.rm */h-n1vbekudat, ot?
参考答案:
The
frequency of a simple periodic wave is equal to the frequency of its
source. The wave is created by the
source moving the wave medium that is in contact with the source. If you have one end of a taut string in your
hand, and you move your hand with a frequency of 2 Hz, then the end of the
string in your hand will be moving at 2 Hz, because it is in contact with your
hand. Then those parts of the medium
that you are moving exert forces on adjacent parts of the medium and cause them
to oscillate. Since those two portions
of the medium stay in contact with each other, they also must be moving with
the same frequency. That can be repeated
all along the medium, and so the entire wave throughout the medium has the same
frequency as the source.
本题详细解析:
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