Here's a few things I'm gonna add to their answer:
Color spectrum: violet (shorter wavelength) has more energy than red (longer wavelength)
Shorter wavelengths contain more energy, and they're more dangerous
(Ultra violet and gamma rays are shorter, infrared, x-rays, and radio waves are longer)
Ultraviolet rays cause skin cancer (mutation in skin cells that causes them to replicate indefinitely), so they are powerful and dangerous
Radio waves are harmless
