Uses for EM Waves

Radio Waves

-Radio and TV broadcasts

-Aircraft communication

Microwaves

-Satellite communication

-Microwave cooking

- Cellular phones

-RADER in speed traps and systems in air traffic control

Infrared

-TV remote controls

-Optical fibers

-Conventional ovens

-Lasers

-Infrared scanners which detect heat

Visible light

-Photosynthesis

-Seeing things around us

Ultraviolet

-Fluorescent lights

-Sterilise surgical equipment and food

-Kills Microbes in food

-Security markings (money)

-Sun beds

X-rays

-Medical imaging

-Security checks

Gamma

-CT scans

-Treatment for cancer

-Nuclear reactors

Properties of EM Waves

-travel through vacuum

-travel at the same speed 3×10^8

-refracted, reflected, diffraction

Wave Model

-Reflection, Refraction, Diffraction, Interference

Particle model

-light waves act as particles “photons”

Photons

Packet of energy found in light