lect_22nov19f08

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

Info iconThis preview shows pages 1–7. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Outline 22 19-NOV-2008 1. Review- 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 ]
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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.
Background image of page 2
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
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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
Background image of page 4
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
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
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? After converting cm to m, we can use the energy equation, E = h
Background image of page 6
Image of page 7
This is the end of the preview. Sign up to access the rest of the document.

Page1 / 28

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

This preview shows document pages 1 - 7. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online