Chapter 13 wave motion and sound 2. The Physical Meaning of Wave Equation (1) Fixed x, corresponding to the oscillating curve of medium element at position x, i.e. y(t, xo) 波函数具有时 间周期性(T) (2)Fixed t, corresponding to the y-x curve (波形图)atta 波函数具有空 间周期性(x)Chapter 13 Wave Motion and Sound 2. The Physical Meaning of Wave Equation: 波函数具有时 间周期性（T ) o A t y T (1) Fixed x, corresponding to the oscillating curve of medium element at position x, i.e. y(t, xo ). (2) Fixed t, corresponding to the y-x curve (波形图) at to. 波函数具有空 间周期性（ ) o y x  2 Ax1 x