Where on the electromagnetic spectrum are ionizing rays found?

Ionizing rays are found at wavelengths of 390nm or less on the electromagnetic spectrum. This region includes ultraviolet (UV) light, X-rays, and gamma rays, all of which have enough energy to strip electrons from atoms, causing ionization. This capability is why they are classified as ionizing radiation.

Wavelengths longer than 390nm tend to have lower energy and are generally non-ionizing, meaning they do not possess sufficient energy to ionize atoms or molecules. This distinction is crucial for understanding the effects of different types of radiation, especially in fields such as electrology and laser technology, where safety and biological effects are paramount. The other options indicate ranges where radiation is either non-ionizing or too high in wavelength, therefore not containing ionizing radiation.