Perform a Google Search for PhET Wave Interference Simulation and run the simulation. Familiarize yourself with the controls and tools, especially the timer, tape measure and field meter. Please show the photo of the experiment being executed 5 times.

1. Using the simulation, click on the "Interference" tab along the bottom. Select a colour of light by dragging the slider to the desired hue. Recall that the period of a wave is the time it takes for one complete cycle and that frequency is the inverse of the period. Place the field meter directly into the wave fronts as shown below. Pause the simulation, bring the timer to record the time it takes for the field meter to show one complete wave. This works best if you place the simulation on slow and "step through" a wave cycle using the button to the right of "play". The timer will measure the time interval in femtoseconds. One fs = 1 x 10^-15 s. Repeat this process a total of 5 times and take an average. Use the relationship between period and frequency and the universal wave equation to calculate the wavelength of the light. Your wavelength should fall between 300 and 800 nm!