Chem 115 1nd Edition Lecture 19Outline of Last LectureI. Bomb ConstantII. Stoichiometry of Thermochemical EquationsIII. Hess’ LawIV. Calculating Hess’ LawOutline of Current LectureI. Wave Nature of LightII. Energy and FrequencyIII. Quantum Theory of EnergyIV. Bohr Model of Hydrogen AtomCurrent LectureWave Nature of Light- Electromagnetic radiation is an example of visible light- Frequency (v) cycles/second- Wavelength (ʎ) distance wave travels in 1 cycle- Amplitude height of wave crest/depth of troughSpeed of light constant C = VʎC = 3.00 X 108 m/sHigh amp brighterVisible light region 400-750 nmEnergy and FrequencyE = hV- Blackbody radiation: solid object emits visible light when it’s heated to 1000K (light bulb)- Color is related to wavelength and frequency- Temperature is related to energyThese notes represent a detailed interpretation of the professor’s lecture. GradeBuddy is best used as a supplement to your own notes, not as a substitute.Quantum Theory of Energy- Any object can emit/absorb only certain quantities of energy- Energy is quantized- An atom changes its energy state by emitting/absorbing 1 or more quanta of energy- Photon: light packet- Photoelectric effect was from Einstein- 1 proton = ( E = hV)Rydberg equation 1/ʎ = R [1/n12 – 1/n22]Bohr Model of Hydrogen Atom- Fixed circular orbit of electrons around a nucleus- Certain energy levels (stationary)- Higher energy is the further the orbit is to the nucleus- Lowest energy state is the ground
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