photon model of light & line spectra
DESCRIPTION
Photon Model of Light & Line Spectra. Atomic Spectra. Most sources of radiant energy (ex. light bulbs) produce many different wavelengths of light ( continuous spectrum ). Atomic Spectra. Elements produce certain colors when excited (via electrical discharge or heat). H. Ne. - PowerPoint PPT PresentationTRANSCRIPT
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Photon Model of Photon Model of Light & Line Light & Line
SpectraSpectra
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Atomic SpectraAtomic Spectra
Most sources of radiant energy (ex. light bulbs) produce many different wavelengths of light (continuous spectrum).
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Elements produce certain colors when excited (via electrical discharge or heat).
H Ne
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Spectral lines can determine the chemical composition of various materials or objects (ex. stars).
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Spectral lines can also tell us about star movement!!!
YES CHILDREN………STARS DO MOVE!!!
Moving towards equipment
Moving away from equipment
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n = 1
n = 2
n = 3
Laser
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Energy is absorbed by the nucleus, then transferred to an e-, causing it to move to a higher energy level.
What does the atomic spectrum of an element tell us?
Photon Model of LightPhoton Model of Light
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What does the atomic spectrum of an element tell us?
Electrons (e-) are either emitting or absorbing energy by changing energy states. Energy lost is in the form of a photon. Each element emits a distinct amount of energy
n = 1
n = 2
n = 3
n = principal quantum #
# = Energy
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Photon Model of LightPhoton Model of Light
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Sometimes when certain Sometimes when certain f f of light shine on of light shine on surfaces, it can cause e- to eject from the materials surfaces, it can cause e- to eject from the materials surface.surface.
Photoelectric EffectPhotoelectric Effect
Photon Model of LightPhoton Model of Light
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Photon Model of LightPhoton Model of Light
This phenomena couldn’t be explained by the wave This phenomena couldn’t be explained by the wave model of light. model of light.
1921- Albert Einstein proposed photon model of 1921- Albert Einstein proposed photon model of light using the Plank’s energy equation:light using the Plank’s energy equation:
E = hE = hffh = Plank’s Constant = 6.63 x 10h = Plank’s Constant = 6.63 x 10-34-34 J•s J•s
1 eV = 1.6 x 101 eV = 1.6 x 10-19-19JJ
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Sample ProblemEach Photon of yellow light, the predominant color in sunlight, carries an energy of 2.5 eV. What is the frequency of this light?
E = hE = hff
h = 6.63 x 10h = 6.63 x 10-34-34 J•s J•s
1 eV = 1.6 x 101 eV = 1.6 x 10-19-19JJf = f = E/hE/h
f = f = (2.5 (2.5 eVeV) () (1.6 x 101.6 x 10-19-19J/eVJ/eV)) / 6.63 x 10/ 6.63 x 10-34-34
J•sJ•sf = f = 6.0 x 106.0 x 101414 Hz Hz
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Umm……ok and where do we use this stuff???Umm……ok and where do we use this stuff???
Photon Model of LightPhoton Model of Light