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Unformatted text preview: 71Chemistry 141Summer 2008Silberberg – Chapter 7Dr. Ben Tovrog72Silberberg Chapter 7 Problem AssignmentThese problems are for your practice. They will not be collected or graded. Easy and Medium:7.2, 7.7, 7.9, 7.11, 7.13, 7.16, 7.20, 7.23, 7.25, 7.31, 7.34, 7.37, 7.41, 7.47, 7.48, 7.49, 7.51, 7.55, 7.57, 7.59, 7.66, 7.74.Hard7.69, 7.71, 7.81, 7.9773Quantum Theory and Atomic Structure7.1 The Nature of Light7.2Atomic Spectra7.3 The WaveParticle Duality of Matter and Energy7.4The QuantumMechanical Model of the Atom74Figure 7.1Frequency and Wavelengthc = λ νThe Wave Nature The Wave Nature ofofLightLight75Figure 7.2Amplitude (intensity) of a wave.76Figure 7.3Regions of the electromagnetic spectrum.77Sample Problem 7.1SOLUTION:PLAN:Interconverting Wavelength and Frequencywavelength in units givenwavelength in mfrequency (s1or Hz)ν= c/λUse c = λν102 m1 cm109 m1 nm= 1.00x1010 m= 325x102 m= 473x109 mν=3x108 m/s1.00x1010 m= 3x1018 s1ν=ν=3x108 m/s325x102 m= 9.23x107 s13x108 m/s473x109 m= 6.34x1014 s1PROBLEM:A dental hygienist uses xrays (λ= 1.00A) to take a series of dental radiographs while the patient listens to a radio station (λ= 325 cm) and looks out the window at the blue sky (λ= 473 nm). What is the frequency (in s1) of the electromagnetic radiation from each source? (Assume that the radiation travels at the speed of light, 3.00x108 m/s.)o1 A = 1010 m1 cm = 102 m1 nm = 109 mo325 cm473nm1.00Ao1010 m1Ao78Wavelength, Frequency, Energy1. An FM station broadcasts classical music at 93.5 MHz (megahertz). Find the wavelength (in m, nm, and A) for this frequency. 2. Rank the following photons in terms of decreasing energy a) IR (v = 6.5 x 10 13s 1), b) microwave (v = 6.5 x 10 11s 1), c) UV (v = 8.0 x 10 15s 1)3. Covalent bonds in a molecule absorb radiation in the IR region and vibrate at characteristic frequencies. a) The CO bond in an organic compound absorbs radiation of wavelength 9.6 μm. What is the corresponding frequency? b) The HCl bond has a frequency of vibration of 8.652 x 10 13Hz. What is the corresponding wavelength. 79Figure 7.4Different behaviors of waves and particles.710Figure 7.5The diffraction pattern caused by light passing through two adjacent slits.711Plank And Einstein – Quantum Theory and PhotonsWhile radiation has wave properties and appears to continuously vary over the visible spectrum, Plank determined that energy is emitted in only discrete levels, i.e....
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This note was uploaded on 07/30/2008 for the course CHEM 141 taught by Professor Mulfod during the Summer '08 term at Emory.
 Summer '08
 Mulfod
 Chemistry

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