Microwaves
General Formulas and Concepts:
Chemistry - Atomic Structure
Electromagnetic Spectrum (F/E is Frequency/Energy)Explanation:
The Electromagnetic Spectrum is defined as:
[Highest F/E] Gamma Rays, X-Rays, Ultraviolet, Visible, Infrared, Microwave, Radio [Lowest F/E]
The Higher the F/E, the shorter the wavelengths.
According to the Electromagnetic Spectrum, we see that Microwaves would be the closest to radio waves; it is right next to it on the Spectrum.