* Understanding the Electromagnetic Spectrum: The electromagnetic spectrum arranges different types of electromagnetic radiation by their frequency (and wavelength). Higher frequency means shorter wavelength, and vice versa.
* Ordering the Waves: From lowest to highest frequency, the waves you listed are:
1. Infrared light
2. Red light (not explicitly listed, but relevant)
3. Yellow light
4. Blue light
5. Ultraviolet light
6. X-rays
Therefore, infrared light has the lowest frequency among the options you provided.
