一振幅为A、周期为T、波长为λ的平面简谐波沿x轴负向传播,在x=λ/2处,t=T/4时振动相位为π,则此平面简谐波的波动方程为()。 A: y=Acos(2πt/T-2πx/λ-π/2) B: y=Acos(2πt/T-2πx/λ+π/2) C: y=Acos(2πt/T+2πx/λ+π/2) D: y=Acos(2πt/T+2πx/λ-π/2)
一振幅为A、周期为T、波长为λ的平面简谐波沿x轴负向传播,在x=λ/2处,t=T/4时振动相位为π,则此平面简谐波的波动方程为()。 A: y=Acos(2πt/T-2πx/λ-π/2) B: y=Acos(2πt/T-2πx/λ+π/2) C: y=Acos(2πt/T+2πx/λ+π/2) D: y=Acos(2πt/T+2πx/λ-π/2)
一振幅为A、周期为T、波长为λ平面简谐波沿X负向传播,在X=(1/2)λ处,t=T/4时振动相位为π,则此平面简谐波的波动方程为:() A: y=Acos(2πt/T-2πx/λ-1/2π) B: y=Acos(2πt/T+2πx/λ+1/2π) C: y=Acos(2πt/T+2πx/λ-1/2π) D: y=Acos(2πt/T-2πx/λ+1/2π)
一振幅为A、周期为T、波长为λ平面简谐波沿X负向传播,在X=(1/2)λ处,t=T/4时振动相位为π,则此平面简谐波的波动方程为:() A: y=Acos(2πt/T-2πx/λ-1/2π) B: y=Acos(2πt/T+2πx/λ+1/2π) C: y=Acos(2πt/T+2πx/λ-1/2π) D: y=Acos(2πt/T-2πx/λ+1/2π)
一振幅为A、周期为T、波长为λ平面简谐波沿x负向传播,在x=λ处,t=T/4时振动相位为π,则此平面简谐波的波动方程为:() A: y.=Acos(2πt/T-2πx/λ-π) B: y=Acos(2πt/T+2πx/λ+π) C: y=Acos(2πt/T+2πx/λ-π) D: y=Acos(2πt/T-2πx/λ+π)
一振幅为A、周期为T、波长为λ平面简谐波沿x负向传播,在x=λ处,t=T/4时振动相位为π,则此平面简谐波的波动方程为:() A: y.=Acos(2πt/T-2πx/λ-π) B: y=Acos(2πt/T+2πx/λ+π) C: y=Acos(2πt/T+2πx/λ-π) D: y=Acos(2πt/T-2πx/λ+π)
【单选题】一平面简谐波,其振幅为 A ,频率为 n .波沿 x 轴 负 方向 传播.设 t = t 0 时刻波形如图所示.则 x = 0 处质点的振动方程为 A. y=Acos[2π n (t+t 0 )+π/2] B. y=Acos[2π n (t-t 0 )+π/2] C. y=Acos[2π n (t-t 0 )-π/2] D. y=Acos[2π n (t-t 0 )+π]
【单选题】一平面简谐波,其振幅为 A ,频率为 n .波沿 x 轴 负 方向 传播.设 t = t 0 时刻波形如图所示.则 x = 0 处质点的振动方程为 A. y=Acos[2π n (t+t 0 )+π/2] B. y=Acos[2π n (t-t 0 )+π/2] C. y=Acos[2π n (t-t 0 )-π/2] D. y=Acos[2π n (t-t 0 )+π]
一个沿x轴作简谐运动的振子,振幅为A,周期为T,其振动方程用余弦函数表达,当t=0时,振子过x=A/[img=25x26]18037477f04835e.png[/img]处向正方向运动,则振子的振动方程为[ ] A: x=Acos(2πt/T-π/3); B: x=Acos(2πt/T+3π/4); C: x=Acos(2πt/T-π/4); D: x=Acos(2πt/T-3π/4);
一个沿x轴作简谐运动的振子,振幅为A,周期为T,其振动方程用余弦函数表达,当t=0时,振子过x=A/[img=25x26]18037477f04835e.png[/img]处向正方向运动,则振子的振动方程为[ ] A: x=Acos(2πt/T-π/3); B: x=Acos(2πt/T+3π/4); C: x=Acos(2πt/T-π/4); D: x=Acos(2πt/T-3π/4);
一平面简谐波沿x轴负方向传播,已知振幅为A,圆频率为ω,波速为u,波源在x=0处,t=0时波源处的质点在平衡位置且向Y轴正方向运动,则该波的波动表达式为( ) A: Y=Acos[ω(t+x/u)-π/2] B: Y=Acos[ω(t-x/u)-π/2] C: Y=Acos[ω(t+x/u)+π/2] D: Y=Acos[ω(t-x/u)+π/2]
一平面简谐波沿x轴负方向传播,已知振幅为A,圆频率为ω,波速为u,波源在x=0处,t=0时波源处的质点在平衡位置且向Y轴正方向运动,则该波的波动表达式为( ) A: Y=Acos[ω(t+x/u)-π/2] B: Y=Acos[ω(t-x/u)-π/2] C: Y=Acos[ω(t+x/u)+π/2] D: Y=Acos[ω(t-x/u)+π/2]
当t=0时,一简谐弹簧振子正经过其平衡位置向X轴正向运动,弹簧振子的运动方程可表示为() A: x=Acos(ωt+π/2) B: v=vmaxcos(ωt+π) C: a=amaxsin(ωt-π/2) D: x=Acos(ωt+π3/2)
当t=0时,一简谐弹簧振子正经过其平衡位置向X轴正向运动,弹簧振子的运动方程可表示为() A: x=Acos(ωt+π/2) B: v=vmaxcos(ωt+π) C: a=amaxsin(ωt-π/2) D: x=Acos(ωt+π3/2)
(接上题)(2)设经分界面反射的波的振幅和入射波的振幅相等,则反射波的波函数是 A: $y_{r}=Acos \left(2\pi \nu t+\dfrac{2\pi\nu}{u}x-\dfrac{\pi}{2} \right),0\le x\le\dfrac{3\lambda}{4}$ B: $y_{r}=Acos \left(2\pi \nu t+\dfrac{2\pi\nu}{u}x \right),0\le x\le\dfrac{3\lambda}{4}$ C: $y_{r}=Acos \left(2\pi \nu t+\dfrac{2\pi\nu}{u}x-\dfrac{\pi}{4} \right),0\le x\le\dfrac{3\lambda}{4}$ D: $y_{r}=Acos\left(2\pi \nu t-\dfrac{2\pi\nu}{u}x \right),0\le x\le\dfrac{3\lambda}{4}$
(接上题)(2)设经分界面反射的波的振幅和入射波的振幅相等,则反射波的波函数是 A: $y_{r}=Acos \left(2\pi \nu t+\dfrac{2\pi\nu}{u}x-\dfrac{\pi}{2} \right),0\le x\le\dfrac{3\lambda}{4}$ B: $y_{r}=Acos \left(2\pi \nu t+\dfrac{2\pi\nu}{u}x \right),0\le x\le\dfrac{3\lambda}{4}$ C: $y_{r}=Acos \left(2\pi \nu t+\dfrac{2\pi\nu}{u}x-\dfrac{\pi}{4} \right),0\le x\le\dfrac{3\lambda}{4}$ D: $y_{r}=Acos\left(2\pi \nu t-\dfrac{2\pi\nu}{u}x \right),0\le x\le\dfrac{3\lambda}{4}$
(2)设经分界面反射的波的振幅和入射波的振幅相等,则反射波的波函数是 A: $y_{r}=Acos \left(2\pi \nu t+\dfrac{2\pi\nu}{u}x-\dfrac{\pi}{2} \right),0\le x\le\dfrac{3\lambda}{4}$ B: $y_{r}=Acos \left(2\pi \nu t+\dfrac{2\pi\nu}{u}x \right),0\le x\le\dfrac{3\lambda}{4}$ C: $y_{r}=Acos \left(2\pi \nu t+\dfrac{2\pi\nu}{u}x-\dfrac{\pi}{4} \right),0\le x\le\dfrac{3\lambda}{4}$ D: $y_{r}=Acos\left(2\pi \nu t-\dfrac{2\pi\nu}{u}x \right),0\le x\le\dfrac{3\lambda}{4}$
(2)设经分界面反射的波的振幅和入射波的振幅相等,则反射波的波函数是 A: $y_{r}=Acos \left(2\pi \nu t+\dfrac{2\pi\nu}{u}x-\dfrac{\pi}{2} \right),0\le x\le\dfrac{3\lambda}{4}$ B: $y_{r}=Acos \left(2\pi \nu t+\dfrac{2\pi\nu}{u}x \right),0\le x\le\dfrac{3\lambda}{4}$ C: $y_{r}=Acos \left(2\pi \nu t+\dfrac{2\pi\nu}{u}x-\dfrac{\pi}{4} \right),0\le x\le\dfrac{3\lambda}{4}$ D: $y_{r}=Acos\left(2\pi \nu t-\dfrac{2\pi\nu}{u}x \right),0\le x\le\dfrac{3\lambda}{4}$
一平面简谐波以速度u沿x轴正方向传播,在t=t'时波形曲线如图所示.则坐标原点O的振动方程为[img=237x134]18032de39d86d2f.png[/img] A: y=acos[p u( t-t¢)/b-p/2] B: y=acos[u( t-t¢)/b+p/2] C: y=acos[2p u( t-t¢)/b-p/2] D: y=acos[p u( t+t¢)/b+p/2]
一平面简谐波以速度u沿x轴正方向传播,在t=t'时波形曲线如图所示.则坐标原点O的振动方程为[img=237x134]18032de39d86d2f.png[/img] A: y=acos[p u( t-t¢)/b-p/2] B: y=acos[u( t-t¢)/b+p/2] C: y=acos[2p u( t-t¢)/b-p/2] D: y=acos[p u( t+t¢)/b+p/2]