问题描述：
英语翻译
Wave speed in a medium
The speed of a mechanical wave is constant in a given ,medium .The speed depends only on the properties of that medium .If the frequency of a wave in a given medium is changed ,then the wavelength is changed .Figure 15-7 shows two waves produced at different times in the same medium.The wavelengths and the frequencies of the waves are different .
Wave speed in a medium
The speed of a mechanical wave is constant in a given ,medium .The speed depends only on the properties of that medium .If the frequency of a wave in a given medium is changed ,then the wavelength is changed .Figure 15-7 shows two waves produced at different times in the same medium.The wavelengths and the frequencies of the waves are different .
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