Homework and Study Notes for 10.14.10

Homework:

• pg 149 #27-35, 38, 40-44
• Homework will be stamped at beginning of class

3rd Period Notes:

• Waves are energy
• Definition of frequency, ν
• E = hν (h is Planck’s constant)
• Wavelength, λ, is inversely proportional to E
• c = λν,
  c is velocity of light, 3.00 x 10⁸ m/s, celeritas
• when an excited electron returns to ‘ground state’ it emits a photon (hν)
• Einstein won Nobel Prize for photoelectric effect
• Fluorescence is when an excited electron returns to a lower energy level than it was excited to.
  
  • Emits a photon of lower energy than initial absorbed energy.
• Emission spectrum (emission spectrum of Fe shown below)

5th Period Notes:

• λ is the symbol for wavelength,
  
  • the distance from peak-to-peak
• Energy is directly proportional to frequency, ν
• E = hν, where h is Planck’s constant
• E is inversely proportion to λ
• Light has duality
  
  • can be either a wave or a particle (photon)
• Green has a higher frequency than red
• Fluorescence is when an excited electron returns to the ground state, and emits a photon of lower (usually) energy than the photon that originally excited the electron.
• Einstein won his Nobel Prize for the photoelectric effect.
• c = λν, where c = 3.00 x 108 m/s (celeritas!).
• Using this info, we could calculate the wavelength of your favorite radio station!
• When an excited electron comes down to a lower energy state, it emits a photon (hν).
• The farther away from the nucleus, the higher the energy of an electron.
• Dmitri Mendeleev created the Periodic Table