12) What are electromagnetic radiation visible light and invisible light?

Electromagnetic radiation encompasses a range of wavelengths, including both visible and invisible light. Visible light is the portion of the electromagnetic spectrum that can be detected by the human eye, typically ranging from about 400 to 700 nanometers. Invisible light includes wavelengths outside this range, such as ultraviolet (shorter than visible light) and infrared (longer), which cannot be seen by humans but can be detected by specialized instruments. Both types of light travel at the speed of light and exhibit wave-particle duality, displaying properties of both waves and particles.