1. m, E, h l, n, c The Big Picture (from yesterday) Particle Wave
(Planck and Einstein)
(Planck)
Light is a…
(Maxwell)
Particle
Wave
Proof:
Proof:
U.V. catastrophe and
Double Slit Experiment (Young)
the photo-elelctric effect
Parameters:
Parameters:
m, E, h
l, n, c

2. The hydrogen bright line spectrum

3. The Bohr Model… a review
Shells
Bohr suggested that electrons existed in _______ surrounding the nucleus.
The shell closest to the nucleus represented the ________amount of energy…
---therefore, shells further away
__________________________________
---in an energy level, the electron can neither
____________________
The electron can ______ to the next energy level (or levels further away if it receives _________________________________
---the lowest energy level is called: _____________
---other than the lowest energy level is
called: ___________________
When electrons move from higher to lower energy levels _______________________________
Do you recognize a significant term which might describe this energy release? _________________
-There are only certain distances allowable
-Distances are analogous to the energy the electron possesses.
(called energy levels)
Lowest
Possess greater amounts of energy
Lose nor gain energy
jump
The exact amount of energy needed
The ground state
An excited state.
Release specific amounts of energy
A quantum or photon

4. -Z2e4me En= 8eo2n2h2 -RZ2 En= n2 The Bohr Equation:
Charge on electron ▼
Mass of electron ▼
-Z2e4me
En=
8eo2n2h2
Planck’s ◄Constant
▲ Permittivity of a vacuum: relates to a material's ability to transmit (or "permit") an electric field.
-RZ2
En= n2
Rydberg Constant
x J Z2
En= n2

5. The Bohr Equation: En = -2.178 x 10-18 J (Z2/n2)
Directions: find the energies associated with the first 7 electron energy levels in the hydrogen atom. Write the values on the appropriate line.
What would be the value for the energy of the infinite energy level (i.e. n = ∞ )?
For n= ∞ E = 0 J
For n= E = x J
For n= E = x J
For n= E = x J
For n= E = x J
For n= E = x J
For n= E = x J
For n= E = x J
Nucleus

6. DE = -3.025 x 10-19J ( a photon of light released)
DE = x 10-19J – ( x J)
DE = x 10-19J ( a photon of light released)
E =hn ; n = E/h n = 4.6 x 1014/s
l x n = c ; l = c/n l = 6.6 x 10-7 m
Find the amount of energy associated with an electron jumping from energy level 3 to energy level 2.
What would be the wavelength of that photon
What would be the frequency of that photon
For n= ∞ E = 0 J
For n= E = x J
For n= E = x J
For n= E = x J
For n= E = x J
For n= E = x J
For n= E = x J
For n= E = x J
Nucleus