Here's why:

* The Electromagnetic Spectrum: The electromagnetic spectrum encompasses a wide range of wavelengths, from very short (like gamma rays) to very long (like radio waves).

* Infrared's Place: Infrared radiation falls somewhere in the middle of this spectrum, with wavelengths longer than visible light but shorter than microwaves.

* Longer Wavelengths: Radio waves have the longest wavelengths in the electromagnetic spectrum. They can be several meters or even kilometers long.

So, while infrared radiation has a longer wavelength than visible light, it's far from the longest wavelength on the spectrum.