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Transcript 
Electromagnetic waves are transverse waves that have some electrical properties and
some magnetic properties. All electromagnetic waves travel at the same speed and do not
require a medium. Unlike sound waves they can travel through a vacuum. The speed of
electromagnetic waves in a vacuum is 300,000,000 m/s.
(At this speed, it takes the light from the sun 8 minutes and 20 seconds to reach Earth.)
Light waves and radio waves are both electromagnetic. Each has properties that make
them useful for some purposes and useless for others. What makes them different?
ALL ELECTROMAGNETIC WAVES HAS DIFFERENT WAVELENGTHS AND
FREQUENCIES.
Speed = wavelength X frequency
Lowest frequency
Longest wavelength
↓
Electromagnetic Wave
Useful
Description
Harmful
Radio Waves
• Information
• Communication
• Entertainment
• Harmless
Microwaves
• Heat food
• Cellular
communication
• May cause cancer
Infrared Waves (heat)
• Warm us
• Warms food
• Burns
*Visible Light
• Colors
• See objects
• Eye damage
Ultraviolet (U.V.)
• Vitamin D
• Healthy skin
• Sunburns
• Skin cancer
X-rays
• See teeth & bones
• Cause cancer
Gamma rays
• Small doses treats
cancer
• Large doses may
cause cancer
↓
Highest frequency
Shortest wavelength
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