3.10 - 3.13) Electromanetic Spectrum & the Uses and Harms

*Remember the order of electromagnetic spectrum.

http://www.kollewin.com/blog/electromagnetic-spectrum/

Properties of Electromagnetic Spectrum

http://en.wikipedia.org/wiki/File:EM_Spectrum_Properties_edit.svg

• Wavelength - decreasing from left to right; Frequency - increasing from left to right
• Electromagnetic waves, unlike mechanical waves, do not require a medium to travel. 
• All electromagnetic waves travel in vacuum at the same speed: 300,000,000 m/s.
• Electromagnetic waves are two dimensional transverse waves which are perpendicular to each other (polarisation).

Uses & Harms of Electromagnetic Waves

*green = uses; red = harms