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25 Cards in this Set
- Front
- Back
What are two types of waves that transfer energy? |
Mechanical Waves and Electromagnetic Waves |
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What are Mechanical Waves?
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Energy is transferred as the wave travels through matter. |
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What are Electromagnetic Waves?
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Do not travel through matter. Can transfer energy through empty space. Example- |
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List rays in order on the Electromagnetic Spectrum from shortest waves to longest.
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Gamma ray, x-ray, ultraviolet ray, visible ray, infarared, microwave, radio.
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What is the trough?
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The lowest point of the wave. |
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What is the wave length?
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the distance from one trough to another trough, one crest to another crest, or one starting point to another starting point.
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What is frequency?
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the number of waves watched passed a point in one second.
Example- ocean - one wave per second. |
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Electromagnetic waves have
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wide range of wave lenghts, frequencies, and levels of energy. The speed at which they travel through space is the same. They travel at the speed of light.
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What is the Electromagnetic Spectrum?
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A chart that lists electromagnetic waves according to their wave lengths.
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Most waves are... |
Invisible.
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The waves that our eyes can see are...
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labelled light. |
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Waves with the highest frequency have
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the shortest wavelength, highest energy |
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Waves with the lowest frequency have
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the longest wavelength, lowest energy. |
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List some mechanical waves.
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rainbow, rock thrown in water, waves, flag blowing, tuning fork mounted on a sound board, avalanche |
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List some electromagnetic waves.
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x-ray, telephone, microphone, t.v., light bulb, doppler radar, radio, |
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Electromagnetic waves surround you. They make you...
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see, keep you warm, cook your food and transmit information. |
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Radio waves have the longest...
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wave lenghts. range from 10,000 kilometer to one millimeter. |
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Can you hear radio waves?
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No. You must use a radio to detect them.
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Various stations in an area broadcast at different...
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frequencies. There you must tune your radio to choose a frequency that you want to listen to. |
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Radio waves. The antennae on your television set receive the signmal in the form of what? |
Electromagnetic wave that is broadcasted from the t.v. station. It is displayed on your t.v. screen. |
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Cable companies have _________ |
antennae or dishes.
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Cellular phone also use radio waves to transmit information. These waves are much __________ than t.v. and f.m. radio waves.
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smaller. Antennae on cell phones are smaller than the antennae on your radio. |
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How does the radio work?
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1. Disk Jockey speaks into the microphone. |
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Radio waves are also used to broadcast what?
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t.v. programs. These waves carry both audio and video information. t.v. circuits seperate information.
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What else are radio waves used for? |
cell phones. |