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解:已知

13. 有一平面简谐波在介质中传播,波速 u =100m/s ,波线上右侧距波源 O ( 坐标原点 ) 为 75.0m 处的一点 P 的运动方程为 y p =0.30cos [ 2πt+π/2 ] m, 求: (1) 波向 x 轴正方向传播时的波动方程; (2) 波向 x 轴负方向传播时的波动方程。. 解:已知. 即点 O 振动超前 p 点. 原点 O 振动方程:. ( 1 )若波沿 x 轴正方向传播时,. 波向 x 轴正方向传播时的波动方程:. 原点 O 振动方程:. ( 2 )若波沿 x 轴负方向传播时,即点 O 振动落后于点 p.

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解:已知

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  1. 13.有一平面简谐波在介质中传播,波速u=100m/s,波线上右侧距波源O(坐标原点)为75.0m处的一点P的运动方程为yp=0.30cos[2πt+π/2]m,求:13.有一平面简谐波在介质中传播,波速u=100m/s,波线上右侧距波源O(坐标原点)为75.0m处的一点P的运动方程为yp=0.30cos[2πt+π/2]m,求: (1)波向x轴正方向传播时的波动方程; (2)波向x轴负方向传播时的波动方程。 解:已知

  2. 即点O振动超前p点 原点O振动方程: (1)若波沿x轴正方向传播时, 波向x轴正方向传播时的波动方程:

  3. 原点O振动方程: (2)若波沿x轴负方向传播时,即点O振动落后于点p 波向x轴负方向传播时的波动方程:

  4. 习题4-14图 14.图示为平面简谐波在t=0时的波形图,设此简谐波的频率为250Hz,且此时图中点P的运动方向向上。求: (1)该波的波动方程; (2)在距原点7.5m处质点的运动方程与t=0时该点的振动速度。 解:

  5. (1)波动方程: 该波沿x轴负方向传播, (2)

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