Final answer:
The highest frequency part of the EM spectrum is composed of gamma rays, while the lowest frequency part is made up of radio waves. The visible spectrum is a small part of the EM spectrum with a frequency range approximately from 4.0 × 10ⁱ⁴ s⁻¹ to 7.9 × 10ⁱ⁴ s⁻¹.
Step-by-step explanation:
The electromagnetic (EM) spectrum encompasses all wave frequencies, including those that are seen by the human eye and those beyond human vision. The highest frequency parts of the EM spectrum are gamma rays, which have the shortest wavelengths and also possess the highest energy. On the other hand, the lowest frequency parts are radio waves, which have the longest wavelengths and the lowest energy. The visible spectrum is a very small part with wavelengths ranging from about 400 nanometers (violet) to 700 nanometers (red), representing a narrow frequency range from approximately 4.0 × 10ⁱ⁴ s⁻¹ to 7.9 × 10ⁱ⁴ s⁻¹. The EM spectrum is continuous and infinite, without gaps, and includes other categories such as microwaves, infrared, ultraviolet, and X-rays.