chapt07_lec

chapt07_lec - 7-1Dr. Wolfs CHM 101Chapter 7Quantum Theory...

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Unformatted text preview: 7-1Dr. Wolfs CHM 101Chapter 7Quantum Theory and Atomic Structure7-2Dr. Wolfs CHM 101Quantum Theory and Atomic Structure7.1 The Nature of Light7.2Atomic Spectra7.3 The Wave-Particle Duality of Matter and Energy7.4The Quantum-Mechanical Model of the Atom7-3Dr. Wolfs CHM 101Wavelength, ,the distance from one crest to the next in the wave. Measured in units of distance.c = Frequency, ,the number of complete cycles per sec., cps, HzElectromagnetic Radiation (light) - Wave likeSpeed of Light, C, same for all EM radiation.3.00 x 1010cm/sec in vacuum7-4Dr. Wolfs CHM 101Amplitude (Intensity) of a Wave7-5Dr. Wolfs CHM 101Regions of the Electromagnetic Spectrumc = = c / 1000 kHz100 MHz3 m300 m7-6Dr. Wolfs CHM 101Sample Problem 7.1SOLUTION:PLAN:Interconverting Wavelength and FrequencyPROBLEM:A dental hygienist uses x-rays (= 1.00A) to take a series of dental radiographs while the patient listens to a radio station (= 325cm) and looks out the window at the blue sky (= 473nm). What is the frequency (in s-1) of the electromagnetic radiation from each source? (Assume that the radiation travels at the speed of light, 3.00x108m/s.)wavelength in units givenwavelength in mfrequency (s-1or Hz)1A = 10-10m1cm = 10-2m1nm = 10-9m= c/Use c = 1.00A325cm473nm10-10m1A10-2m1cm10-9m1nm= 1.00x10-10m= 325x10-2m= 473x10-9m=3x108m/s1.00x10-10m= 3x1018s-1==3x108m/s325x10-2m= 9.23x107s-13x108m/s473x10-9m= 6.34x1014s-17-7Dr. Wolfs CHM 101Different behaviors of waves and particles.7-8Dr. Wolfs CHM 101The diffraction pattern caused by light passing through two adjacent slits.7-9Dr. Wolfs CHM 101Electromagnetic Radiation - ParticlelikeThe view that EM was wavelike could not explain certain phenomena like :1) Blackbody radiation - when objects are heated, they give off shorter and more intense radiation as the temperature increases, e.g. dull red hot, to hotter orange, to white hot.......But wavelike properties would predict hotter temps would continue to give more and more of shorter and shorter wavelengths. But instead a bell shape curve of intensities is obtained with the peak at the IR- Vis part of the spectrum.7-10Dr. Wolfs CHM 101Blackbody RadiationE = hElectromagnetic Radiation E = hc/Plancks constanth = 6.626 x 10-34J-s7-11Dr. Wolfs CHM 101Electromagnetic Radiation - ParticlelikeThe view that EM was wavelike could not explain certain phenomena like :2) Photoelectron Effect - light shinning on certain metal plates caused a flow of electrons....
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chapt07_lec - 7-1Dr. Wolfs CHM 101Chapter 7Quantum Theory...

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