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25 Cards in this Set

  • Front
  • Back
The energy of a single particle of light is called a
Light has wave-like properties including
frequency and wavelength.
Harmonic waves can be characterized
using a host of properties.
Amplitude, crest/trough, wavelength.etc..
The height of a wave.
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.
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.