chapter 38
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Chapter 38. The Atom and the Quantum. Quantum Physics. The branch of physics that is the general study of quanta (singular-quantum) in the microworld of the atom. Models. used to study the atom because there is no direct view of an atom’s internal structure. Bohr Model. - PowerPoint PPT PresentationTRANSCRIPT
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Chapter 38
The Atom and the Quantum
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Quantum Physics
• The branch of physics that is the general study of quanta (singular-quantum) in the microworld of the atom.
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Models
used to study the atom because there is no direct view of an atom’s internal structure
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Bohr Model
developed by Neils
Bohr in 1913;
planetary model
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Light used to explain atoms
Does light move as particles or as waves?
Answer: Light moves in particles
that act as waves
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Max Planck and Albert Einstein
Light is in packets of energy called quanta.
We now call quanta “photons”
This idea gives use to quantum theory and quantum mechanics.
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Quantum Mechanics
the branch of physics that is the general study of the motion of quanta in the microworld of the atom.
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Light from Electrons
Electrons are in electron levels around the nucleus.
When energy is applied to the atom, electrons enter an excited state and jump to the next higher level.
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Light from Electrons
When returning to regular level, energy is released in
the form of light (emission).
Each atom has a unique light emission.
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Light from Electrons
Tungsten (W)
Filament in regular light
bulb emits “white or normal light”