General Physics (PHY 2140). Lecture 33. Modern Physics Atomic Physics Atomic spectra Bohr’s theory of hydrogen. http://www.physics.wayne.edu/~apetrov/PHY2140/. Chapter 28. Lightning Review. Last lecture: Atomic physics Early models of atom.
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Review Problem: If matter has a wave structure, why is this not observable in our daily experiences?
The “size” of the atom in Rutherford’s model is about 1.0 × 10–10 m. (a) Determine the attractive electrical force between an electron and a proton separated by this distance.
(b) Determine (in eV) the electrical potential energy of the atom.
Electron and proton interact via the Coulomb force
r = 1.0 × 10–10 m
F = ?
PE = ?
Potential energy is
different values of n
Bohr’s model addresses those problems
A photon is emitted as a hydrogen atom undergoes a transition from the n = 6 state to the n = 2 state. Calculate the energy and the wavelength of the emitted photon.
ni = 6
nf = 2
l = ?
Photon energy is