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题一列横波的波源在原点O处,t=0时刻波源开始振动,经0.4s,振动由O向右传播了一个波长λ=20cm,此时波形如图1所示.在x轴上有一点P,P到原点O的距离为110cm,则从波源起振开始,经多长时间P点第一次到达波峰?
The wave source of the transverse wave of the first column is at the origin O, and the wave source begins to vibrate at t=0. After 0.4 s, the vibration propagates from the right to the right with a wavelength of λ=20 cm. The waveform is shown in Figure 1. There is a little on the x axis. The distance between P and P to the origin O is 110cm. Then the vibration starts from the source. How long does P reach the peak for the first time?