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Optics: The EM Spectrum
Radio Waves to Gamma Rays (Dr. Buettner, ECPI)
9
Physics
Undergraduate 1
10/29/2010

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Term
Radio Waves
Definition
Lowest frequency; longest wavelength (1 to 100 meters) ; lowest energy;
Term
Microwaves
Definition
Above Radio Waves and Below Infrared; wavelength: 1 cm; used for cell phones.
Term
Infrared
Definition
Frequency: higher than microwaves,lower than visible light; not visible but can be felt as heat.
Term
Visible Light
Definition
Light we can see; frequency: higher than infrared, lower than ultraviolet; colors red (low frequency) to purple (high frequency)
Term
Ultraviolet
Definition
Frequency: higher than visible light, lower than x-rays; wavelength: smaller than average cell, can cause sunburn.
Term
X-rays
Definition
Frequency: higher than ultraviolet, lower than gamma rays; wavelength: about the size of an atom; can pass through some matter easily.
Term
Gamma Rays
Definition
Highest Frequency, shortest wavelength, highest energy; wavelength the size of atomic nucleus.
Term
Order of the spectrum from lowest frequency to highest
Definition
Radio, microwave, infrared, visible (red), visible (violet), ultraviolet, x-ray, gamma ray
Term
Order of the spectrum from smallest wavelength to largest
Definition
gamma, x-ray, UV, visible (violet), visible (red), infrared, microwave, radio
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