Final answer:
Among the given options of electromagnetic radiation types, Radio waves have the longest wavelength, which also means they have the lowest frequency and energy.
Step-by-step explanation:
The question asks which of the following types of electromagnetic radiation has the longest wavelength: Microwave, X-rays, Infrared light, Radio waves, Visible light. According to the electromagnetic spectrum, electromagnetic radiation is categorized by wavelength. As wavelengths increase, the energy and frequency decrease, meaning that the type of electromagnetic radiation with the longest wavelength will have the lowest energy and frequency.
The correct order of electromagnetic radiation types from shortest to longest wavelength is as follows: gamma rays, X-rays, ultraviolet, visible light, infrared, microwaves, and radio waves. Therefore, the type with the longest wavelength among the options given is (D) Radio waves.