Light Waves. A. ELECTROMAGNETIC WAVES 1. Do not require a medium to travel through 2. They transfer...
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Transcript of Light Waves. A. ELECTROMAGNETIC WAVES 1. Do not require a medium to travel through 2. They transfer...
A. ELECTROMAGNETIC WAVES
1. Do not require a medium to travel through
2. They transfer energy without transferring particles
3. Travel by transferring energy between vibrating electric and magnetic fields
Ex: an electric charge that moves back and forth
B. PROPERTIES OF ELECTROMAGNETIC WAVES
1. Radiant energy: the energy carried by an electromagnetic wave.
2. Wave speed a. travel at the speed of light (in a vacuum)
~ 2.99 x 108 m/sec b. depends on the medium it travels in
~ travels the slowest in solids
C. OTHER USES1. RADAR – Radio Detecting and Ranging
~ measures the time required for the radiowave to bounce off of object
2. MRI – Magnetic Resonance Imaging~ different tissues absorb different amounts of radio
waves and emits radiant energy
3. Infrared Waves ~ remote controls, CD-ROMs, snakes, firefighters, police
4. UV – Ultraviolet Light~ useful to kill bacteria, our ozone, fingerprinting
5. “X-Rays” – x-rays and gamma rays~ absorbed by bones and not by soft tissue