Here's why:

* Electromagnetic Spectrum: Light exists on a spectrum with various types of radiation, categorized by their frequency (and wavelength).

* Frequency and Energy: Higher frequency light has more energy.

* Order of the Spectrum (Increasing Frequency):

* Radio waves

* Microwaves

* Infrared radiation

* Visible light

* Ultraviolet radiation

* X-rays

* Gamma rays

Since microwaves are located *before* infrared radiation on this spectrum, they have a lower frequency.