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Transcript of ElectroMagnetic Waves
electromagnetic spectrum. Infrared light has a range of wavelengths that range from red light to violet. "Near Infrared" light is the closest in wavelength to visible light. "Far infrared" light is closer to the microwave region of the spectrum. "Far infared" waves are thermal. We expeirence this type everday from sunlight, fire, radiator, or a warm sidewalk. Shorter, near infrared waves are not hot at all. You can't see them or feel them. These are the waves used to control your T.V. Visible light These are the only electromagnetic waves that we can see. We see these waves as the colors of the rainbow. Each color in a rainbow corresponds to a different wavelength of electromagnetic spectrum. Red has the longest wave length.
Violet has the shortest. When all of the waves are seen together, they make white light. Water vapor in the atmosphere can also break apart wavelengths creating a rainbow. Cones in our eyes are recievers for these tiny visible light waves. The color of an object that we see is the color of light reflected. We are blind to many wavelenghts of light. Ultraviolet Waves This light has shorter wavelengths than visible light. These are the waves responsible for sunburns. This image is of the sun taken at an extreme ultraviolet wavelength. Review 1. What can electromagnetic waves be described by? wavelength, energy, frequency 2. What are three things that transmit electro magnetic waves? microwaves, X-rays, lights, T.V's, Radios. 3. Which has the longest wave lengths? Radio waves. 4. Which are the only waves that we can see? Visible light 5. When all of the waves are seen together, what do we see? White light 6. Which wavelengths can be measured in centimeters? Microwaves. 7. Which carry waves for T.V's and cell phones? radio waves. Cable companies use cables to transmit tbese waces to your house so you can watch you T.V.