Electromagnetic Waves

wizzstuffingUrban and Civil

Nov 16, 2013 (3 years and 8 months ago)

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Electromagnetic Waves

Chapter 12

What is an Electromagnetic Wave?


Electromagnetic wave


is made by vibrating
electric charges and can travel through space


No medium is needed…

What is an Electromagnetic Wave?


Electromagnetic wave


is made by vibrating
electric charges and can travel through space


No medium is needed…



Electric and magnetic fields are related forces.

1.
A

moving electric charge creates a magnetic field

2.
Changing magnetic fields create changing
electric fields and vice versa

Electromagnetic Fields


Carry radiant energy


Electromagnetic waves travel in a vacuum
(empty space) at 300,000 km/
s


they slow as they travel through matter

The Electromagnetic Spectrum


Radio waves


Infrared waves


Visible light


Ultraviolet light


X rays and gamma rays

Uses of Electromagnetic Spectrum


Radio waves
-

Microwaves, Radar, and Magnetic
Resonance Imaging (MRI)


Infrared waves


felt as thermal energy or
warmth


Visible light


duh… we see with this light


Ultraviolet waves


kill bacteria and can be
absorbed by fluorescent materials and released
as visible light


X rays and gamma rays


provide images of
bones, examines within materials, radiation
therapy


Radio Communication


Radio converts electromagnetic waves into
sound waves

Television


Sounds and images changed into electronic
signals broadcast by carrier waves


Carrier wave


a specific frequency in which each
channel is assigned (used in radio too)


Telephones


Microphone converts sound waves into
electrical signal.