student will learn: relationship between light & electrons what produces color electromagnetic...
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Student will learn:
Relationship between light & electrons
What produces color
Electromagnetic Spectrum Readings
Neils Bohr Model of Hydrogen Readings
Atomic theory = Dalton
Electron discovery = JJ Thomson
Electron charge = Millikan
Nucleus discovery = Rutherford
Neutron = Chadwick
Neils Bohr
What keeps the negative electrons from falling toward the positive nucleus?
Neils BohrWhat keeps the negative electrons from falling
toward the positive nucleus?
The emission of light is related to the behavior
of the electrons.
Light as a stream of photons
Tiny little packets of quantum energy
Light as a Wave
Light: travels in waves, made up of photons
Photons : zero mass, contain a quantum energy
Glasses Light = electromagnetic radiation
energy from light affects electrons
• Ground State: lowest energy state of an atom.
• Excited State: an atom has absorbed energy higher than ground state.
• Electromagnetic radiation: The energy given off when an excited
atom returns to its ground state.
“production of colored light / luster of a metal”
Absorption / Emission of Photon
An excited atom returns to a lower energy level.
Ground State
Excited State
Photon emitted
The color of the photon emitted depends on the energy change that produces it.
Excited state one
Excited state two
Each photon emitted corresponds to a particular energy change.
4 excited states… each one may emit a different color
? What is the principal number of electrons that produces the 1094
infared wavelength?
? A Red light is produced when the electrons fall back from energy level 3 to energy level_________.
? A Violet light is produced when the electrons fall back from energy level __________ to energy level_________.
? For hydrogen to produce a UV wavelength the electron must fall back from what to what?
Student will learn:
Relationship between light & electrons
What produces color
Electromagnetic Spectrum Readings
Neils Bohr Model of Hydrogen Readings
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