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1985至1990年的六年中,全国高考物理试题有五题是有关波的图象的,且构思都比较巧妙,又各有特色。本文首先对这些题目进行分析解答,然后找出这类题目解法的规律。 1、(1985年第六题)一列横波在x轴上传播着,在t_1=0和t_2=0.005秒时的波形图线为图1所示。 (1)由图中读出波的振幅和波长。 (2)设周期大于(t_2-t_1),如果波向右传播,波速多大?如果波向左传播,波速又是多大? (3)设周期小于(t_2-t_1)并且波速为6000米/秒,求波的传播方向。解:(1)由图看出振幅A=0.2米,波长λ=8米。
In the six years from 1985 to 1990, there were five questions in the national college entrance examination physics test, which were related to the images of the waves, and the ideas were ingenious and each had its own characteristics. This article first analyzes and solves these problems, and then finds out the law of the solution to these problems. 1. (Sixth question in 1985) A series of transverse waves propagates on the x-axis. The waveform diagrams at t_1=0 and t_2=0.005 seconds are shown in Fig. 1. (1) The amplitude and wavelength of the wave are read from the graph. (2) Let the period be greater than (t_2-t_1), if the wave propagates to the right, what is the velocity of the wave? If the wave propagates to the left, what is the velocity of the wave? (3) Set the period less than (t_2-t_1) and the velocity of the wave is 6000m/s , to find the direction of wave propagation. Solution: (1) It can be seen from the figure that the amplitude A = 0.2 meters and the wavelength λ = 8 meters.