We’re being asked to rank the given electromagnetic radiation in order of decreasing wavelength.
We’re given the following radiation:
Red Light Radio Waves Microwaves Infrared Light
Ultraviolet Light X-rays Gamma Rays Violet Light
Recall that in the electromagnetic spectrum, radiation:
• On the left side: has high energy and frequency and low wavelength
• On the right side: has low energy and frequency and high wavelength