from the experiment, we obtained interference pattern by using four different methods. the first interference pattern that we obtained,we determine the distance between two speakers are 1.2 meters and the distance between the middle of the distance and two speakers and sound card are 1.0 meters then we read the sound level every 5 centemeter between x=0cm. to x=100cm. and record the sound level. repeat with change the valve from the tables then using python to plot the graph.
the value of sound level that we obtained depending on