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2. Light waves are electromagnetic waves. This means that there does not need to be a medium for the wave to travel through and that it has a "universal" speed called the "speed of light." If you multiply the speed of light by the period, you get the distance the wave travels during one cycle. This is called the "wavelength." The electromagnetic spectrum given below describes the wavelength pictorially and numerically. Visible Light name of Radio waves Microwaves Infrared X-rays Gamma wave wavelength (meters)102 1'm im 10-1 10-2 103 104 10 10m 10'm 10 109 10-10 10-1! 10-12 length of wavelength football field " human bee pin head cell bateria virus atom nuclei image courtesy of http://science.hq.nasa.gov Note how small the visible light spectrum is relative to the entire spectrum. If you were to describe this to someone who did not know trigonometry, what would you say? Does something similar happen for sound waves