Go to the PhEl' simulation website: htt s: het.colorado.edu sims html waveinterference Iates waveinterference en.htm| Select the \"Waves" box Select the speaker option [red arrow] Make sure the wave setting is selected [blue arrow) and not the pulse setting. Make sure the frequency is set in the middle of the range [green arrow}. Press the green button on the speaker to turn it on and produce sound. Observe the wave using the \"Waves\