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Chem 103 Light

by: Karlee Nelsen

Chem 103 Light CHEM 103 - 002

Karlee Nelsen
General Chemistry I
Sanchita Hati

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About this Document

Chem 103 week 9 notes on light waves and particles
General Chemistry I
Sanchita Hati
Class Notes
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This 2 page Class Notes was uploaded by Karlee Nelsen on Friday October 30, 2015. The Class Notes belongs to CHEM 103 - 002 at University of Wisconsin - Eau Claire taught by Sanchita Hati in Fall 2015. Since its upload, it has received 20 views. For similar materials see General Chemistry I in Chemistry at University of Wisconsin - Eau Claire.

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Date Created: 10/30/15
Electromagnetic Radiation Light oscillating electric and magnetic fields traveling through space Wavelength A 1 Complete Wavelength l Amplitude Node Frequency Mt How often a wave passes a certain point in a certain amount of time Node where Amplitude is zero Amplitude MaX height of a wave Wavelength L Distance from peak to peak or crest to crest Measured in m or nm Wavelength increases as frequency decreases meaning that wavelength and frequency are inversely related Amplitudeintensity doesn t affect wavelength or frequency Can be increased through constructive interference where wave crests match up Frequency f and Energy are directly related Electromagnetic Spectrum Visible Light 700nm 600nm 500nm 400nm v Radio waves Microwaves Infrared Ultraviolet Xrays Gamma LONGER WAVELENGTH meters SHORTER gt I I I I I I I l I I I I I I I I I 102 11 1 1o 1 102 103 104 105 106 107 108 109 1010 1011 1012 1013 c speed of light 2998 X 108 ms f frequency A wavelength nm cft Quantum Theory When a solid is heated it emits electromagnetic radiation known as blackbody radiation over wide ranges of wavelengths By Max Planck Quantum energy that is the smallest amount of energy that can be emitted or absorbed h Plank s constant 663 X 103934 J s E hf Combine E hf and cft hc 1 As frequency of L increases the energy of the photon light particle increases Blue Light gt Energy gt Red Light Photoelectric Effect Certain metals eject e39 when light hits the surface light must exceed a threshold energy minimum in order for this to occur excess energy goes into the Kinetic energy of the photon Photons tiny massless energetic particles Light is a particle and a wave but not at the same time PROBLEM EXAMPLE Blue light has a wavelength of 400nm What is its energy cM Ehf E 663 x 10 34js x 300 x 108 mS E 497 x 10 19 400 x 10 9m When electrons move from higher levels energy to lower energy levels energy in the form of light is emitted Shown by the equation 1 1 1 ER whenx gt 2 RRydberg constant 10974 x 107 m


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