The two-dimensional liquid gratings have diffraction properties on light. This experiment designed and fabricated an orthogonal two-dimensional liquid grating. Based on the experimental design and principal analysis, the multiple diffraction patterns were obtained by experiments for different light sources. This device was employed to measure the speed of ultrasound in the clear water. Furthermore, the study examined how the speed of ultrasound in clear water varies with temperature and was contrasted with theoretical values. The experimental results attain a remarkably high level of measurement precision.
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