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### 25 Cards in this Set

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