All types of Electromagnetic Radiation
- are transverse waves and do not require a medium to travel
- travel at the same speed in a vacuum (space)
- follow laws of reflection and refraction
- are not deflected by electric and magnetic fields
Electromagnetic (EM) radiation
Electromagnetic (EM) radiation is a form of energy all around us and takes many forms, such as radio waves, microwaves, X-rays and gamma rays.
- Radio waves are at the lowest range of the EM spectrum, with frequencies of up to about 30 billion hertz, or 30 gigahertz (GHz), and wavelengths greater than about 10 millimetres (0.4 inches).
- Microwaves fall in the range of the EM spectrum between radio and IR.
- Infrared is in the range of the EM spectrum between microwaves and visible light.
- Visible light is found in the middle of the EM spectrum, between IR and UV. It has frequencies of about 400 THz to 800 THz
- Ultraviolet light is in the range of the EM spectrum between visible light and X-rays. It has frequencies of about 8 × 1014 to 3 × 1016 Hz
- Gamma-rays are in the range of the spectrum above soft X-rays. Gamma-rays have frequencies greater than about 1018 Hz and wavelengths of less than 100 pm (4 × 10−9 inches).