chem 211 1 notes

chem 211 1 notes - Electromagnetic radiation Is oscillating...

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Electromagnetic radiation Is oscillating electric and magnetic fields that travel at c (3.00 x 10^8 m/s) Amplitude is height of wave, amplitude squared determines intensity Wavelength is peak to peak distance Number of cycles per second is frequency ( v) Wavelength x frequency = c Radiation, quanta photons Planck found E = h( v ) h is planck’s constant Radation can only be generated if an oscillator of that frequency has reached minimum energy to start oscillating…rejecting classical mechanics Photoelectric effect: ejection of electrons from a metal when exposed to ultraviolet radiation No electrons ejected until radiation has a frequency above threshold of metal Electrons ejected immediately, not matter how lo intensity Kinetic energy of electrons increases linearly w/ frequency of radiation 2 1/ 2 mv h ν = - Φ kinetic energy = energy supplied by photon minus energy required to eject electron this supports that photon behave like particles, but diffraction shows that photons behave like waves
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