151F09Disc 5 lightD2L - GenChem 5 meeting th Welcome to...

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GenChem 1 Welcome to your Welcome to your Chem 151 Chem 151 Discussion. Discussion. Where chemistry comes to you! Where chemistry comes to you! 5 th meeting
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GenChem 5 th Class Measurement Today’s Agenda: Explore light Form a team Relate wavelength and frequency Compute energy of light photons practice, practice, practice
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GenChem Light Interactions Light Interactions Because atoms have an electrical nature, they can interact with light. Light Waves can be Light Waves can be characterized characterized by their wavelength by their wavelength Wavelength ( Wavelength ( λ λ ) ) - - distance distance between the top of nearby between the top of nearby crests. (meters-m) crests. (meters-m)
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GenChem Electromagnetic Spectrum
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GenChem Electromagnetic Radiation Electromagnetic Radiation Frequency Frequency -Number of waves per unit time. -Number of waves per unit time. (1/s=s (1/s=s -1 = -1 = Hertz=Hz) Hertz=Hz)
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GenChem What does light do? γ-ray –destroys tissue X-ray – penetrates tissue – knocks out e’s UV- moves e’s; breaks bonds Visible- moves e’s inside of atoms (jumps) IR causes molecules to vibrate- no e jump Microwave- spins molecules; rotates bonds Radio/TV – passes through tissue will flip the nucleus of H MRI Long waves – communications through the earth
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GenChem Light from Glowing objects Most heated solid objects (light bulbs, electric stove) give all the colors of the spectrum (white light) but in different amounts – we see the most intense. red hot ” (mostly red) and “ white hot ” (more blues)
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GenChem So….Form a team of 4 Try to have at least one laptop per group…
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GenChem Interaction Light-Matter λ ν = c where where c c = speed of light = = speed of light = 2.998 x 10 2.998 x 10 8 m/sec m/sec 3 x 10 3 x 10 8 m/s m/s Basic Relationships Energy per photon Energy per photon E = h • E = h • ν ν h h = = Planck’s constant Planck’s constant
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This note was uploaded on 02/06/2012 for the course CHEM 151 taught by Professor Staff during the Fall '08 term at University of Arizona- Tucson.

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151F09Disc 5 lightD2L - GenChem 5 meeting th Welcome to...

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