3.10 understand that light is part of a continuous electromagnetic spectrum which includes radio, microwave, infrared, visible, ultraviolet, x-ray and gamma ray radiations and that all these waves travel at the same speed in free space

The electromagnetic spectrum is a range of different frequency waves. The spectrum is split into radio, micro, infrared, light, ultra violet, x-ray and gamma. All of these waves travel at the same speed in a vacuum, they are also all transverse waves.