The teaching of wave physics has developed over the years, including devices that demonstrate water waves being used effectively for a long time. However, it was not easy to select and display the wave frequencies. This research had developed a DIY Ripple Tank experiment set using a smartphone application to measure the properties of water waves. The vibrations of the source characterized by points and bars with a speaker and a small amplifier (model GF1002) connecting to the source with a wave ball displayed on the screen. The apparatus controlled the wave source by adjusting the frequency ranging from 10–30 Hertz via the PhyPhox application on a smartphone. Waves then were created in two types of liquid: water and a salt solution. Images of waves appearing on the receiver were adjusted to a standstill by the Strobe Light Tachometer application on the smartphone which allows us to adjust flashing light frequencies to match the frequency of the wave and the frequency of the sound source. As a result, we found that this research shows the relationship according to the equation of speed of a sinusoidal wave at different viscosity coefficients of the liquid. The speed of the wave in water and salt solution were found to be 0.079 ± 0.003 m s−1 and 0.074 ± 0.005 m s−1, respectively. This research can be applied in school as a demonstration showing that physics of the wave is easy and interesting.
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