Zibo Zhen computer photography

Test analysis: the amplitude and period can be read directly from the vibration image; Because we don't know the propagation direction of the wave, we need to discuss two possible propagation directions, find out the position of two simultaneous points in the image and determine the possible wavelength number between the two points. Then the possible value of wave velocity can be obtained from the relationship among wavelength, frequency and wave velocity.

According to the difference between the abscissas of the two maximum values of the vibration image as the vibration period, option B is correct; From the ordinate of the image, we can see the amplitude, and the C option is correct; According to the vibration image given in the question, if the wave propagates from 0 to 1, then if the wave propagates from 1 to 0, the wave velocity and wavelength can be calculated as sum (wave propagates from 1 to 0, n=0), but sum is not the only answer, so both A and D are wrong.

Comments: It is rare to draw the vibration image of two particles in the same coordinate system with a dotted line, but such a drawing method is very common in y-x, so some candidates regard this question as a waveform diagram without looking at the meaning of the abscissa, and get the wrong answer of "the wavelength must be 4cm", which is the innovation of this question; In the final analysis, candidates have not developed the good habit of solving problems, doing problems by feeling and lacking analysis, which is a direction that proposition experts often make. At the same time, we should pay attention to the multiplicity of time and space in wave propagation.