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15 Cards in this Set
- Front
- Back
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Electromagnetic Wave
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Energy carrying wave emitted by vibrating charges that is composed of oscilating electric and magnetic fields that regenerate one another. Radio to gamma waves.
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Electromagnetic Spectrum
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Range of frequencies from the lowest (radio waves) to the highest (gamma waves).
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Transparent
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Materials that allow light to pass through them in straight lines.
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Opaque
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Materials that obsorb light without remission and consequently do not allow light through them.
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Shadow
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Shaded region the appears where light rays are blocked by an object.
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Frequency
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For a vibrating body or medium, the number of vibrations per unit time. For a wave, the number of crests that pass a particular point per unit time. Measured in hertz.
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Wavelength
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Distance between successive crest troughs, or identical parts of a wire.
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Radio Wave
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Electromagnetic waves of the longest wavelength and lowest frequency.
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Resonance
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Phenomenon that occurs when the frequency of forced vibrations on an object matches the object's natural frequency, producing a dramatic increase in amplitude.
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Remission
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Passing light energy through a material and out the other side.
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Shiny
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Occurance of resonance and the vibration of electrons build up to large amplitudes.
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Light
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Visible part of the electromagnetic spectrum.
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UVA
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The majority of UV light reaching the Earth is in this form.
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UVB
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Shorter than UVA rays and penetrate the superficial skin layer (epidermis), causing skin to tan or burn.
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UVC
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Usually blocked by the Earth's atmosphere and not a concern to humans except at high altitudes or in areas of low atmospheric zones.
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