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25 Cards in this Set
- Front
- Back
The energy of a single particle of light is called a
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photon.
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Light has wave-like properties including
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frequency and wavelength.
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Harmonic waves can be characterized
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using a host of properties.
Amplitude, crest/trough, wavelength.etc.. |
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Amplitude
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The height of a wave.
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Crest/Trough
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The highest(lowest) point of a wave.
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Wavelength measures
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the length of wave or the distance between troughs (crests).
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Frequency (f or v)
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The number of cycles per unit time that pass through a given point. Measures how fast a wave oscillates.
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For a given velocity
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frequency and wavelength are inversely related.
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Period (T)
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The time of one complete cycle.
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Velocity (v)
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The speed at which a wave propagates.
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For any wave we say that
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one complete cyle is 360 degrees or 2 pie.
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Wavefront
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All the points of equal phase make up a wavefront.
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Coherence is a
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measure used to compare two light waves.
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Coherent light
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The phase difference b/w waves is constant. The energy per unit area delivered by this light is constant in time.
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Incoherent light
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consists of waves with random phase differences. The energy per area delivered by this light changes with time.
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Intensity is
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The energy per unit area per time crossing a given point.
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Superposition principle
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individual waves can be added together.
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Destructive interference
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waves combine is such a way that the oscillations of the resulting wave are smaller than the original.
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Constructive interference
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waves combine in such a way that the oscillations of the resulting wave are larger than those of the original.
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When two waves are superimposed,
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the relative phase of the 2 original waves determines the type of interference.
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If waves are in phase,
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the resulting waveform will have an amplitude equal to the sum of the individual amplitudes.
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Overall Spectrum (highest to lowest frequency)
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1.Gamma rays 2.X-rays 3.UV rays 4.Visible 5.IR 6.Microwaves 7.Radar waves 8. TV waves 9.Radio waves
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Ground state
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lowest energy state
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Excited state
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Any state with E greater than E0.
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A packet of energy (photon)
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is then absorbed or emitted during these transitions.
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