Light Kim Lachler Updated 2015 NCES: 6.P.1.1 & 6.P.1.2

Light Is: Potential changing to Kinetic - moves Electromagnetic – does not need a medium to travel Transverse - Particles vibrate up and down to the energy

Electromagnetic Made up of Electric field Pulls oppositely charged objects toward it and repels like charged objects It surround every object Magnetic field It surrounds magnets Certain metals are attracted to it

Electromagnetic It produces a vibration from electrically charged particles. When they vibrate the electric field also vibrates and a vibrating magnetic field is created. The transfer of energy as an electromagnetic wave is called RADIATION. The_Nature_of_Light.mov

Electromagnetic Spectrum Is the complete range of electromagnetic waves. Most are invisible. They all travel at the same speed. Speed of light 300,000 kilometers per second

Electromagnetic Spectrum The wavelength and frequency tells you what kind of wave it is. – The_Electromagnetic_Spectrum.mov The_Electromagnetic_Spectrum.mov

Electromagnetic Spectrum Gamma rays They have the shortest wavelength and the fastest frequency They can kill living cells. They are used to sterilize medical equipment.

Electromagnetic Spectrum X-rays Can travel through most soft objects but not hard. Used for medical and security purposes.

Electromagnetic Spectrum Ultraviolet rays Can cause chemical reactions to happen. In skin it increase the production of melanin. This creates a tan but can also lead to skin cancer.

Electromagnetic Spectrum Visible light These are the waves we can see.

Electromagnetic Spectrum Infrared rays Given off by hot objects. Night goggles detect these.

Electromagnetic Spectrum Microwaves They are easy to control and direct. Used for cooking by causing the molecules to vibrate at the same time. Radar (radio detection and ranging) sends out a microwave that is reflected off solid objects. (Like a echo)

Electromagnetic Spectrum Radio waves They have the longest wavelength and the lowest frequency. Radio and T.V. stations use these. Their frequency number tells you what station to tune in to.

Bibliography Holt, Rinehart, Winston, North Carolina Holt Science & Technology, Holt, Rinehart, Winston, Orlando, 2005 The Usborne Internet-Linked Science Encyclopedia, Usborne Publishing Ltd, England, 2000 Google images, accessed 1/31/11www.googleimages.com Acoustics Animations, Dr. Dan Russell, accessed 1/31/11