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lect_22nov19f08

# lect_22nov19f08 - Outline 22 19-NOV-2008 1 Review(black...

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1 Outline 22 19-NOV-2008 1. Review- (black body & photoelectric) Light – Waves (c = λ ν) & Particle Duality E photon = h ν = ΔE atom , 2. Atomic spectra (Experiment) Lines? Rydberg 3. Bohr Model of H Atom (Theory) a. energy levels, E n ; b. photons from E i E f E if = R h [1/n i 2 - 1/n f 2 ]

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2 Review: Light, Wave or Particle? Waves c = λ ν Planck (1900)- Matter exchanges energy in units of ΔE atom = hν. Suggests atoms have discrete energies. E n = n hν, n = 0,1,2,3,4… Einstein (1905)- Light consists of particles ( photons ), E photon = hν. Dual nature of Light!? Wave &Particle?
3 Skip: Did one just like this last time. You work it out. Name________ Quiz 21 TA_______Lab Section_____ Radio station KTIE broadcasts with frequency of 590 kHz on AM dial. C = 3.00*10 8 (m/s); h = 6.63*10 -34 J*s 1.Calculate the wavelength. 2.Calculate the energy of a photon of this frequency. 2.Calculate the energy of a mol of photons of this frequency

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4 Review: Light, Wave or Particle? Ex: KTIE has frequency of 590 kHz, AM. 1. Find wavelength in m. c = λν so 3.00*10 8 m/s = λ 5.90*10 5 Hz*(s -1 /Hz ) λ = 3.00*10 8 (m/s)/5.90*10 5 (1/s) = 508 m (KUCR, 88.3 MHz, FM) has 3.40 m! 2. Find energy of one photon with this frequency. E = hν = (6.63*10 -34 J*s)* (5.90*10 5 (1/s)) = 3.91*10 -28 J
5 Review: Light, Wave or Particle? Ex: (cont.) KTIE has frequency of 590 kHz. 3. Find energy of one mole of photons with this frequency. E = N A = 6.02*10 23 (photons/mol)* (6.63*10 -34 (J*s/photon))* (5.90*10 5 (1/s)) = 2.35*10 -4 J/mol

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6 Sample Problem 7.2 SOLUTION: PLAN: Calculating the Energy of Radiation from Its Wavelength PROBLEM: A cook uses a microwave oven to heat a meal. The wavelength of the radiation is 1.20cm. What is the energy of one photon of this microwave radiation?
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