题目内容
Some source of disturbance & elastic mediums are needed for the travel of mechanical waves.
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Some source of disturbance & elastic mediums are needed for the travel of waves.
During the time of one period, the wave travels a distance that must correspond to one wavelength.
The length of a complete wave shape is called wavelength.
Energy, the shape of wave, & oscillatory (vibrational) state are transmitted by a wave, but the particles are not.
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