题目内容
Energy, the shape of wave, & oscillatory (vibrational) state are transmitted by a wave, but the particles are not.
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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.
In the wave equation, the origin (原点) of the axis must be selected at the wave source.
In the wave equation, it is convenient to select the wave source as the origin (原点) of the axis.
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