what i did for spring break …. bit of administration …. readingreading –bsnv chaps. 7 and 8...
DESCRIPTION
The Physics of Light Spectroscopy and Atomic Physics Spectroscopy and Atomic Physics Types of Spectra Types of Spectra Continuous - No spectral lines Absorption - Dark lines superimposed on continuous spectrum Emission - Isolated bright linesTRANSCRIPT
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What I did for Spring Break …What I did for Spring Break …
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Bit of Administration ….Bit of Administration ….• ReadingReading
– BSNV Chaps. 7 and 8 BSNV Chaps. 7 and 8
• Particularly important discussion section - Particularly important discussion section - don’t miss this weekdon’t miss this week
• Additional observations for Lab 2, through April 5Additional observations for Lab 2, through April 5
• Washburn Observatory - 7 - 9 Monday, TuesdayWashburn Observatory - 7 - 9 Monday, Tuesday– Drop in for Venus, Mars, Saturn, Jupiter, Orion …Drop in for Venus, Mars, Saturn, Jupiter, Orion …
• Honors - 4:30 this afternoon, Astronomy LibraryHonors - 4:30 this afternoon, Astronomy Library
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The Physics of LightThe Physics of Light
• Spectroscopy and Atomic PhysicsSpectroscopy and Atomic Physics
• Types of SpectraTypes of Spectra
Continuous - No spectral linesContinuous - No spectral lines
Absorption - Dark lines superimposed on continuous spectrumAbsorption - Dark lines superimposed on continuous spectrum
Emission - Isolated bright linesEmission - Isolated bright lines
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The Physics of LightThe Physics of Light• Spectroscopy and Atomic PhysicsSpectroscopy and Atomic Physics
• Graphical SpectraGraphical SpectraIn
tens
ity
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The Physics of LightThe Physics of Light• Spectroscopy and Atomic PhysicsSpectroscopy and Atomic Physics
• Kirchoff’s LawsKirchoff’s Laws
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The Physics of LightThe Physics of Light• SpectroscopySpectroscopy
• Thermal RadiationThermal Radiation
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The Physics of LightThe Physics of Light• SpectroscopySpectroscopy
• Thermal RadiationThermal Radiation
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The Physics of LightThe Physics of Light• SpectroscopySpectroscopy
• Thermal RadiationThermal Radiation• Wien LawWien Law
€
λmax = 3x106
T
λmax in nmT in oK
λλmaxmax
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The Physics of LightThe Physics of Light• SpectroscopySpectroscopy
• Thermal RadiationThermal Radiation• Wien LawWien Law• Stefan-Boltzmann LawStefan-Boltzmann Law
€
E flux =σT 4
Stefan-Boltzmann constant
fluxflux energy emitted energy emitted from square meterfrom square meter in one second in one second
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The Physics of LightThe Physics of Light• Spectroscopy and Atomic PhysicsSpectroscopy and Atomic Physics
• Kirchoff’s LawsKirchoff’s Laws
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The Physics of LightThe Physics of Light• Spectroscopy and Atomic PhysicsSpectroscopy and Atomic Physics
• Quantum Mechanics - Electron can only be in certain specificQuantum Mechanics - Electron can only be in certain specific orbits <=> can only have certain specific energiesorbits <=> can only have certain specific energies
QuantumQuantumNumbersNumberse
HydrogenHydrogenAtomAtom
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The Physics of LightThe Physics of Light• Spectroscopy and Atomic PhysicsSpectroscopy and Atomic Physics
• Quantum Mechanics - Electron energy changes can only haveQuantum Mechanics - Electron energy changes can only have certain values corresponding to energy changes between orbitscertain values corresponding to energy changes between orbits ==> only certain energies of photons can be absorbed or emitted ==> only certain energies of photons can be absorbed or emitted
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The Physics of LightThe Physics of Light• Spectroscopy and Atomic PhysicsSpectroscopy and Atomic Physics
• Shine “white” light onto hydrogen atom; for simplicity, considerShine “white” light onto hydrogen atom; for simplicity, consider all electrons to be in level 2 (highly unrealistic!)all electrons to be in level 2 (highly unrealistic!)
Wavelength
Phot
ons/
sec
White lightWhite light
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The Physics of LightThe Physics of Light• Spectroscopy and Atomic PhysicsSpectroscopy and Atomic Physics
• Only photons with energy equal to energy differenceOnly photons with energy equal to energy difference between orbits 2 and 3 are absorbed. This energybetween orbits 2 and 3 are absorbed. This energy corresponds to a wavelength of 660 nm.corresponds to a wavelength of 660 nm.
Wavelength
Phot
ons/
sec
660 nm
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The Physics of LightThe Physics of Light• Spectroscopy and Atomic PhysicsSpectroscopy and Atomic Physics
• Photons with energy equal to energy differencePhotons with energy equal to energy difference between orbits 2 and 3 are emitted. These photonsbetween orbits 2 and 3 are emitted. These photons are emitted in all directions.are emitted in all directions.
Wavelength
Phot
ons/
sec
660 nm
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The Physics of LightThe Physics of Light• Spectroscopy and Atomic PhysicsSpectroscopy and Atomic Physics
• Kirchoff’s LawsKirchoff’s Laws
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The Physics of LightThe Physics of Light• Spectroscopy and Atomic PhysicsSpectroscopy and Atomic Physics
• Energy Level DiagramsEnergy Level Diagrams
Ground State
Ener
gy
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The circled arrows (“electron transitions”) represent The circled arrows (“electron transitions”) represent
A) emission linesA) emission lines B) continuous emissionB) continuous emission C) absorption linesC) absorption lines
ConcepTest!ConcepTest!
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You would expect these emission lines to be found in what part of You would expect these emission lines to be found in what part of the electromagnetic spectrum? the electromagnetic spectrum?
A) UltravioletA) Ultraviolet B) OpticalB) Optical C) InfraredC) Infrared D) RadioD) Radio
ConcepTest!ConcepTest!
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The Physics of LightThe Physics of Light
• Hydrogen SpectrumHydrogen Spectrum
BalmerSeries
Lyman Series
Wavelength (nm)
Infrared Optical Ultraviolet
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TelescopesTelescopes• Fundamental Purpose - To Collect LightFundamental Purpose - To Collect Light
Light from a StarLight from a Star
Faint Bright Brightest
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TelescopesTelescopes• Fundamental Purpose - To Collect LightFundamental Purpose - To Collect Light
1 cm
5 cm
10 cm
Collecting Area = R2 = * 1 cm2
Collecting Area = R2 = * 100 cm2
Collecting Area = R2 = * 25 cm2
“ 0.2m Telescope ”
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TelescopesTelescopes• DesignDesign
Focu
s(I
mag
e)
LightDetector Refractor
ObjectiveLens
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TelescopesTelescopes•ExamplesExamples
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40” RefractorYerkes ObservatoryWilliams Bay, WI
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TelescopesTelescopes• DesignDesign
Focu
s(I
mag
e)Light
Detector
LightDetector Refractor
ObjectiveLens
Reflector
ObjectiveMirror
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TelescopesTelescopes• DesignDesign
Focu
s(I
mag
e)Light
Detector
LightDetector Refractor
ObjectiveLens
Reflector
ObjectiveMirror
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TelescopesTelescopes•Light Detectors - Charge-Coupled Devices (CCDs)Light Detectors - Charge-Coupled Devices (CCDs)
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TelescopesTelescopes•Light Detectors - Charge-Coupled Devices (CCDs)Light Detectors - Charge-Coupled Devices (CCDs)
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TelescopesTelescopes•ExamplesExamples
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TelescopesTelescopes• Electromagnetic Electromagnetic SpectrumSpectrum
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TelescopesTelescopes
•Beyond Visible LightBeyond Visible Light
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TelescopesTelescopes
•Telescopes in SpaceTelescopes in Space
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TelescopesTelescopes•Telescopes in SpaceTelescopes in Space
OpticalInfrared
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Optical
X-ray
CrabNebula
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Tucson 1975 Tucson 1995