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Transcript of Electromagnetic Waves
Sources of EM waves
-many EM waves present on Earth come from the Sun
- other stars are sources of EM waves
-EM waves from the Sun provide most of the energy for the environment on Earth
How do they form?
Energy that moves in the form of EM waves is called radiation. An EM wave can travel without a material medium -that is, in a vacuum or space empty of matter- and does not lose energy as it moves. In theory, an EM wave can travel forever.
The speed of EM Waves in a Vacuum
- EM waves travel at a constant speed of about 300,000 kilometers (186,000 mi) per second.
-In 1 second, EM waves can travel a distance greater than 7 times the distance around the Earth
-the distances of space are measured in this units, called light speed
How EM waves travel in a vacuum
Converting Energy from one form to Another
How EM waves interact with a medium depends on the type of the wave and the nature of the material
EM waves usually become noticeable and useful when they transfer energy to a medium
-in a vacuum, EM waves transfer energy only by moving potential energy from one place to another
You are surrounded by WAVES!
Electromagnetic Waves can travel through a vacuum!
Electromagnetic waves can interact with a material medium
Questions to think about
1) How are EM waves different from mechanical waves?
2) What are two sources of EM waves in Earth's environment?
3) How can EM waves transfer energy differently in a material medium as compared to a vacuum?
What are the two types of fields that make up an EM wave?
Remember, EM waves do not give up energy in traveling. They spread outward form all directions from the source of the disturbance until something (a medium) interferes with them.