business plan M-TICK ”Need help with your home electronics?” Group 2 Max Svensson Thomas Finell Isamu Ioka Christian Östman Kenneth Treuthardt
Dec 20, 2015
Homework AssignmentHomework AssignmentChap 9Chap 9
Review Questions (p 187): 1 – 22Review Questions (p 187): 1 – 22
Multiple Choice Questions: 1 - 3Multiple Choice Questions: 1 - 3
Visible light consists of electromagnetic waves
Electromagnetic radiation: emission and transmission of energy in the form of electromagnetic waves.
Speed of light (c) in vacuum = 3.00 x 108 m/s
Fig. 8.11
White light is separated into its color
components by a diffraction grating
Fig 9.10 (b)
The tracks of a compact disc act as a diffraction grating,producing a separation of the colors of white light.
1. e- can only have specific (quantized) energy values
2. light is emitted as e- moves from one energy level to a lower energy level
Bohr’s Conceptual Model of the Atom
(1913)
n (principal quantum number) = 1,2,3,…
Fig 9.19
e-
De Broglie (1924) reasoned that e- is both particle and wave.
Why is e- energy quantized?
Fig 9.21
This is a matter wave,
not an em wave!
Standing or stationary wavesStanding or stationary waves
nodes nodes
Zero probability of finding the electron
Maximum probability of finding the electron
Dual nature of the electronDual nature of the electron
• How can we locate a particle if it behaves as a wave?!How can we locate a particle if it behaves as a wave?!
• The uncertainty principleThe uncertainty principle::
• It is impossible to know simultaneously the energyIt is impossible to know simultaneously the energy
and the position of a particle.and the position of a particle.
• We choose to know the We choose to know the energyenergy as precisely as possible as precisely as possible
• Refer to “position” of electron in terms of Refer to “position” of electron in terms of probabilityprobability..