题目内容
During the time of one period, the wave travels a distance that must correspond to one wavelength.
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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.
For waves, for each element, its energy increases when energy is transferred in, and its energy decreases when energy is transferred out.
Waves are a way of propagating (传播) energy.
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