NCSU CH 101 - Chemisty Chapter 2 Notes (5 pages)

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Chemisty Chapter 2 Notes



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Chemisty Chapter 2 Notes

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Pages:
5
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 Y rays 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 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 Planck s Constant o The energy of light is proportional to it s frequency E hv o Planck s Constant is h which is equal to 6 626 10 34 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 with kinetic energy There is a minimum frequency below which no electrons are ejected called the threshold frequency o When frequency of light threshold frequency Energy of quantum W Excess energy is converted into the kinetic energy of the ejected electron KE hv W hv hvo o The stream of quanta were later named photons Energy of each photon hv o Beam that contains n photons has total energy nhv Wave Particle Duality o Light behaves as both a particle and a wave o



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