modern physics the photoelectric effect. what is modern physics? modern physics is what we have...
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Modern Physics
The Photoelectric Effect
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What is Modern Physics?
• Modern Physics is what we have discovered and created in the area of Physics in the last 100 years.
• The Atomic Bomb• Radiation• The nature of light (kinda)
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Review of Light
• Consider everything you know up until now about light…
• Is a beam of light an object? Does it have mass?
Does it have gravity?Does it have Kinetic Energy?
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Review of Light
• Consider everything you know up until now about light…
• Can light transfer energy?Increase temp?Create Electricity?
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The nature of light
• Sometimes, light acts just like an object.
• Not a continuous beam, and not a wave.
• When we think of light this way it is called a PHOHTON (Star Trek- Photon Torpedos…)
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Photons
• Photons are little “balls” of light that carry around energy that can be transferred if the photon hits something else.
• Photon Symbol:
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The structure of an atom
Nucleus
ElectronEnergy Levels
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The structure of an atom
Nucleus
ElectronEnergy Levels
Can electrons go from the first energy level to the second? How?
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The structure of an atom
Nucleus
ElectronEnergy Levels
Can electrons go from the first energy level to the second? How? - It gains energy…
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The structure of an atom
Nucleus
ElectronEnergy Levels
Can electrons go from the second energy level to the first? How?
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The structure of an atom
Nucleus
ElectronEnergy Levels
Can electrons go from the second energy level to the first? How? -It looses energy…
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The structure of an atom
Nucleus
ElectronEnergy Levels
What happens to an electron in the outermost energy level if it gains still more energy?
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The structure of an atom
Nucleus
ElectronEnergy Levels
What happens to an electron in the outermost energy level if it gains still more energy? -Bye!!
The electron is free from the atom!
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The structure of an atomWhat is one way electrons can GAIN energy and go up an energy level?
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The structure of an atomWhat is one way electrons can GAIN energy and go up an energy level? -It can get hit by a Photon!
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The structure of an atomIf the photon has enough energy or if the electron is in the outer level, the electron can even break free from the atom.
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The structure of an atomWhat happens if an electron goes down a level? Where does the lost energy go?
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The structure of an atomWhat happens if an electron goes down a level? Where does the lost energy go? -It’s released in the form of a Photon.
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The structure of an atomIf enough photons hit enough atoms, and set enough electrons free, you get ELECTRICITY!
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The structure of an atomThis phenomenon is known as the PHOTOELECTRIC EFFECT.
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The structure of an atomWhat is an example of light creating electricity from the PHOTOELECTRIC EFFECT?
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The structure of an atomWhat is an example of light creating electricity from the PHOTOELECTRIC EFFECT?
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The Photoelectric Effect
• The photoelectric effect is easiest to observe though certain METALLIC elements in their solid form due to their tendency to loose electrons without a lot of photon energy present.
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Web Simulation
• Complete the Lab Simulation at www.colorado.phet.edu about the Photoelectric Effect
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