Electromagnetic Radiation Waves a review p Most waves

Electromagnetic Radiation

Waves… a review p Most waves are either longitudinal or transverse. p Sound waves are longitudinal. p But all electromagnetic waves are transverse…

Electromagnetic waves p Produced by the movement of electrically charged particles p Can travel in a “vacuum” (they do NOT need a medium p Travel at the speed of light p Also known as EM waves

Wave-particle Duality p Light can behave like a wave or like a particle p A “particle” of light is called a photon

Radio waves p Longest wavelength EM waves p Uses: n TV broadcasting n AM and FM broadcast radio n Avalanche beacons n Heart rate monitors n Cell phone communication

Microwaves p Wavelengths from 1 mm- 1 m p Uses: n Microwave ovens n Bluetooth headsets n Broadband Wireless Internet n Radar n GPS

Infrared Radiation p Wavelengths in between microwaves and visible light p Uses: n n n Night vision goggles Remote controls Heat-seeking missiles

Visible light p Only type of EM wave able to be detected by the human eye p Violet is the highest frequency light p Red light is the lowest frequency light

Ultraviolet p Shorter light p Uses: n n wavelengths than visible Black lights Sterilizing medical equipment Water disinfection Security images on money

Ultraviolet (cont. ) UVA UVB and UVC Energy Highest of UV waves Lower than UVA Health risks p Extremely low risk for DNA damage p Can destroy Vitamin A in skin p Can cause DNA damage, leading to skin cancer p Responsible for sunburn

X-rays p Tiny wavelength, high energy waves p Uses: n n n Medical imaging Airport security Inspecting industrial welds

Gamma Rays p Smallest wavelengths, highest energy EM waves p Uses n n n Food irradiation Cancer treatment Treating wood flooring

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