Electromagnetic spectrum order (increasing frequency) (Radio → Microwave → Infrared → Visible → UV → X-ray →)

jee-mainjee-advancedneet-ug

Radio → Microwave → Infrared → Visible → UV → X-ray → Gamma (ν ↑)

What each symbol means

SymbolWhat it stands for
λWavelength in vacuum: c = νλ
νFrequency (Hz)

When to use this

Standard ordering by increasing frequency (decreasing wavelength in vacuum). Sub-bands exist within each region.