Ours is 2450 MHz. C frequency of the light x wavelength. Measure the distance between the centres of two of the melted points.
If c is what we wish to determine we will have to know the other two variables.
Speed of light wavelength x frequency. Wave frequency is how many times a wave bounces up and down in one second. So the video thatll show you how to. Remember to use your upper and lower boundary measurements to put error limits on your measurement.