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30 Cards in this Set
- Front
- Back
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Gamma rays |
Electromagnetic wave with the highest frequency and smallest wavelength |
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X rays |
Electromagnetic wave with wavelengths just shorter than ultraviolet rays |
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Ultraviolet rays |
Electromagnetic wave with wavelengths just shorter than visible light |
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Visible light rays |
Electromagnetic waves that are visible to the eye |
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Infrared rays |
Electromagnetic wave with wavelengths just shorter than radio waves |
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Microwaves |
Radio wave with highest frequency and shortest wavelength |
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Radio waves |
Electromagnetic wave with the longest wavelength and lowest frequency |
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Photon |
A packet of light energy |
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Radar |
A system that uses reflected radio waves to detect objects and measure the distance and speed of an object. It sends out radio waves that reflect off an object. The time it takes to reflect can measure the distance. To measure speed, the device uses the doppler effect. |
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Polarized Light |
The light that passes through vibrates in only one direction. Light acts as a wave when it passes a polarized filter. Ordinary light can vibrate all over. The filter makes the light go in only one direction. The light that is passed through is polarized light. |
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Communication sattelites |
They receive radio, television, and telephone signals and relay the signals back to the receivers on Earth. |
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Frequency |
The number of complete waves that pass a given point in a certain amount of time. |
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ROY G BIV |
Red, Orange, Yellow, Green, Blue, Indigo, Violet |
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Radiation |
The energy that is transferred by electromagnetic waves. |
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Thermogram |
A picture taken with an infrared camera that shows regions of different temperatures in different colors. |
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illuminated |
An object that can be seen because it reflects light |
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Luminos |
An object that gives off its own light |
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Electromagnetic wave |
A transverse wave that transfers electrical and magnetic energy. |
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photoelectric effect |
When a beam of light shines on some substances, it causes electrons to move. It causes an electrical current to flow. Light can cause electrons to move so much that it is knocked out of the substance. That is the photoelectric effect |
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Electromagnetic spectrum |
A complete range of electromagnetic waves placed in order of increasing frequency |
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Incandescent lights |
A light bulb that glows when a filament inside it gets white hot |
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Tungsten Halogen Lightbulb |
A bulb that has a tungsten filament and contains a halogen gas such as iodine or bromine |
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Fluorescent lights |
A bulb that contains a gas and is coated on the inside with a powder. When an electric current passes through the bulb, it causes the gas to give off an ultraviolet ray. When the ray hits the powder it causes powder to give off visible light. |
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Neon Lights |
A sealed glass tube that contains neon gas. An electric current passes through the neon, particles of the gas absorb energy. The particles cannot hold the energy for long. The energy is released in the form of light. |
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How are electromagnetic waves produced? |
When a charged particle moves, it produces a magnetic field. A magnetic field exerts magnetic forces that can act on certain materials. When a charged particle moves its motion, its magnetic field changes. The changing magnetic field causes the electric field to change. When one field vibrates so does the other. In this way,the two fields constantly cause each other to change. |
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AM |
Amplitude Modulation is a method of transmitting signals by changing the amplitude of a wave. They have long wavelengths and are easily reflected. |
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How does AM work? |
The information that will become sound is coded in changes, or modulations, of a waves amplitude. The frequency of the wave remains constant. At a radio broadcasting station, sound is converted into electronic signals. The signals are then converted into a pattern of changes in the amplitude of the wave remains constant. |
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FM |
A method of transmitting signals by changing the frequency of a wave. They have higher frequencies and more energy than AM waves |
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Cell phones |
They transmit and receive signals using high frequency microwaves. When you call, the phone sends a microwave. The microwaves are unique to each phone. A tower picks it up and sends it to a hub. The tower/hub transmits to the receiving cellular phone. |
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Hey |
YeaH |
