In this laboratory, we investigate one of the most fundamental properties of light: its speed.
We often perceive light as something instantaneous, but its movement is simply undetectable by ordinary vision. Using deformable food items such as marshmallows, a simple way to approximately measure the speed of light is to first measure its wavelength in a microwave by finding the distance between hotspots, i.e. where objects like marshmallows would melt without a rotating disk. Based on the frequency indicated in the microwave's manual, calculating the speed of light is trivial using its dispersion relation: wavelength x frequency = v.