Vibrations and Waves (id: aee59ca46)

本题目来源于试卷: Vibrations and Waves，类别为 IB物理学

[问答题]
When a sinusoidal wave crosses the boudqpf c8) i (rl7 sw+o6njvr23cndary between two secti1pn7 g veefd1)ons of cord as in Fig. 11–33, the frequency does not change (although the wavelength and velocity do changfepd 7e1)g nv1e). Explain why.

参考答案:
The frequency must stay the same because the media is continuous – the end of one section of cord is physically tied to the other section of cord.  If the end of the first section of cord is vibrating up and down with a given frequency, then since it is attached to the other section of cord, the other section must vibrate at the same frequency.  If the two pieces of cord did not move at the same frequency, they would not stay connected, and then the waves would not pass from one section to another.


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