radio waves, microwaves, and infra - red waves are on the low energy side of the electromagnetic spectrum…

Brief Explanations:

According to the electromagnetic spectrum, low - energy waves (such as radio waves, microwaves, and infra - red waves) have long wavelengths. The relationship between energy ($E$) and wavelength ($\lambda$) is given by the formula $E=\frac{hc}{\lambda}$ (where $h$ is Planck's constant and $c$ is the speed of light). As energy decreases, wavelength increases.

Answer:

LONG