NCSU CH 101 - Chemisty Chapter 2 Notes (8 pages)

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Chemisty Chapter 2 Notes



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Chemisty Chapter 2 Notes

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Pages:
8
School:
North Carolina State University
Course:
Ch 101 - Chemistry - a Molecular Science

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Chemisty Chapter 2 Notes I Nature of Light Electromagnetic Radiation o Oscillating electric and magnetic fields that travel though space at a speed of 2 998x108 m s o Light behaves as both a wave and a particle o Light waves vary in wavelength and frequencies o Includes radio waves microwaves UV X rays and Yrays Light Properties o Wavelength Distance between 2 maxima minima o White light Sum of all of the colors that comprise visible light o Frequency the number of oscillations of a light wave during one second measured in nm o Relationship between speed frequency and wavelength C C Speed of light 3 00 108 m s V Frequency Wavelength o Long wavelength small frequency low energy o Short wavelength large frequency high energy o The Light Spectrum is a display of the component colors of a light beam seperated by wavelengths o Because all colors continuously merge together they form a continuous spectrum II Quantization Discovery o The energy of a system at the atomic level could not take on continuous values the are quantized or discrete o All object emit electromagnetic waves which increase with temperature o This emission from a warm body is called blackbody radiation o The total energy of a wave cannot be varied continuously because it s composed of a lot of tiny bundle of energy called quanta Max Planck o Solved the Ultraviolet Catastrophe Why metal glowed white instead of staying red when hot Found that objects can gain or lose energy by absorbing emitting energy by absorbing emitting radiant energy in quanta Planck s Constant o The energy of light is proportional to it s frequency E hv o Planck s Constant h is equal to 6 626 10 34 o Light consists of particles called photons which posses discrete energy o Energy in a wave is E nhv n number of quanta in the wave o Increasing the intensity of light increases the number of quanta it contains Photoelectric Effect o When certain metals are irradiated wih light they eject electrons o o o with kinetic energy There is a



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