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45 Cards in this Set
- Front
- Back
a discrete "packet" of energy
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quantum theory
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speed of light in a vacuum
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300,000 km per second
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electromagnetic radiation with a frequency slightly higher than that of visible light
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ultraviolet
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visible light with the lowest frequency
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red
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visible light with the lowest frequency
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violet
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the additive primary colors
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red, green, blue
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the subtractive primary colors
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cyan, yellow, magenta
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bulges outward and causes rays of light passing through it to bend inward
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convex lens
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phenomenon in which a distant object appears to be nearby as a result of reffraction of light by heated air
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Mirage
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hollowed inward and causes rays of light passing through it to bend outward
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concave lens
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the process by which colors are produced by interference when light is reflected
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Iridescence
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the idea that light can be pictured as streams of tiny particles emitted by light sources
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the particle theory
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what color do u see when all colors of visible light enter at the same time
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white
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what is the absence of color
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black
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an arrangment of all electromagnetic radiation in order of frequency and wavelength
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electromagnetic spectrum
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what is a nanometer
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a billionth of a meter
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a piece of glass or other substance specially designed to refract light
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lens
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1)all motion must be measured relative to some arbitrary reference point; and 2)the speed of light is constant in relation to any observer
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theory of relativity
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the apparent slowdown in time for a rapidly moving object
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time dilation
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low-frequency electromagnetic widely used for communication
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radio wave
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electromagnetic rays that is just below red visible light in terms of frequency
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infrared rays
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electromagnetic waves that our eyes can perceive
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visible light
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rays that cause sunburns
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UV
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electromagnetic radiation with very short wavelengths
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x-rays
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the most powerful form of electromagnetic radiation, consisting of extremely high frequency and energy and great penetrating ability
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gamma rays
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tiny bundle or "packet" of energy that travels as an electromagnetic wave
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photons
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abbreviation for 'speed of light in a vacuum'
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C
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the spreading out of a wave after it passes through a narrow opening
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diffraction
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a change in the sourse of a wave as the result of a collision with an object or boundary
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reflection
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the reinforcement or cancellation that occurs when two or more waves meet
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interference
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a bending of a path of a wave as a result of a change in wave speed
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refraction
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a semicircular arc of colored bands of light in the sky formed by the dispersion of white sunlight into its component of colors by airborne water droplets
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rainbow
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a device that uses radio waves to detect object and measure their distance
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radar
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dangerous to human cells
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UVB
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the process of photon emission by stimulated of already-exited atoms
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stimulated emission
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describing light that consists of a single frequncy or wavelength, and thus of a single pure color
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monochromatic
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describing electromagnetic waves that are in phase of moving in the same direction
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coherent
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referring to a beam of light containing waves that all vibrate in the same direction
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polarized
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the technique of transmitting light through narrow glasslike "wires" called optical fibers
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fiber optics
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a three-dimensional image produced by laser light
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hologram
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discovered that light is many colors combined
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Isaac Newton
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proposed the wave theory of light
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Christian Huygens
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demonstrated that light seems to consit of two transverse waves vibrating back and forth aganst eachother
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James Clerk Maxwell
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demonstrated the invisible electromagnetic waves
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Heinrich Hertz
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discovered a strange form of radiation that resembled ultraviolet rays in its effect on matter
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Wilhelm Roentgen
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