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Quantum Mechanics and the Bohr Model
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Quiz 11-7-12• Identify the symbols
1. ν2. λ3. Ca4. K5. Na6. B7. Ba8. Mg9. E10.c
Memorize the following
Quantum Mechanics and the Bohr Model
Electrons are arranged in energy levelsThe normal energy state is called the ground state
The excited energy level is called the excited state.
Electrons gain energy
When electrons relaxback down to the ground state, electromagneticradiation is given off.Light = electromagnetic radiation
Energy is released in the form of light
Electrons are arranged in energy levels.
Electrons gain energy
When electrons relax back down to the ground state electromagneticradiation is given off. The more energy levels the electron travels, the more energetic the “light”.
Energy in the form of light
more energygiven off as light
less energygiven off as light
• Higher energy = higher frequency
• Lower energy = lower frequency
How do you calculate the energy given off by electrons when they relax back down to the
“ground state”?
• Step 1 – underline important information.• Step 2 – identify the knowns and unknowns.
• Step 3 – identify the correct equation.
• Step 4 – rearrange the equation to solve for the unknown.• Step 5 – solve for the unknown.
• Step 1 – underline important information.
• Step 1 – underline important information.• Step 2 – identify the knowns and unknowns.
• Step 1 – underline important information.• Step 2 – identify the knowns and unknowns.
• Step 3 – identify the correct equation.• E = h ν or c = λ ν
c = λ ν Step 4 – rearrange the equation to solve for the unknown.
c = λ ν
• Step 5 – solve for the unknown.
• Step 1 – underline important information.
• Step 2 – identify the knowns and unknowns.
• Step 3 – identify the correct equation.• E = h ν or c = λ ν
• E = h ν or c = λ ν
• Step 4 – rearrange the equation to solve for the unknown.
HW
• By Wednesday Finish all of the “light math” worksheets.
• 11/8 Page 17 due• 11/9 page 19 due• 11/14 page 20 due• Thursday Lab page 21• extra credit sheets pp 23, 27 mv = momentum– v in momentum is VELOCITY not ν (frequency).