—平面谐波的表达式为y = 0. 03cos(8t+3x + π/4)(SI),

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问题 —平面谐波的表达式为y = 0. 03cos(8t+3x + π/4)(SI),则该波的频率v (Hz),波长λ(m)和波速u(m/s)依次为:

选项

答案A

解析[img]/upload/tiku/190/2457484_1.jpg[/img]
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