Physics: Electromagnetic Spectrum

Tonising Radiation

UV- X-ray, gamma can ionise an atom (add or remove electrons). 

• damage - 'burns'
• kill
• mutate cells ===> change DNA ===> cancer

Cancer treatment - radiotherapy. 

UV security marker

Special dyes absorb UV and re-emit visible light. They are only visible under UV light.

The EM spectrum describes the range of wavelengths of energy that can be recorded using remote sensing and can be broadly divided (by increasing wavelength) into Gamma rays, X-rays, UV, Visible, Infrared, Microwave and Radio waves.

The units of measurement are the nanometre (nm) and (more often)…