Photons and Electrons

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  • Created by: Mal
  • Created on: 19-03-14 12:54
Preview of Photons and Electrons

First 52 words of the document:

Free Electrons
Outside the atom a free
electron can be given any
Kinetic Energy (limited by
the speed of light).
We can accelerate (or
decelerate) electrons by
applying a potential
difference. This is the
basis of the "electron gun"

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Free Electrons
The energy gained by an
electron (of charge e) in a
potential difference V is
eV = ½mv2
(N.B.…read more

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Bound Electrons
So outside the atom an
electron can experience
fractional changes to its
Kinetic Energy.
Inside the atom an
orbiting electron is limited
to a fixed list of allowed
Kinetic Energy values.…read more

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The Atom
Images like this are badly
out of scale.…read more

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The Atom
If you imagine the nucleus
of a typical atom to be the
size of a marble, then the
closest electron will be
orbiting about 2 miles
away (roughly 3km).…read more

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The Atom
Obviously the size of
atoms and nuclei vary
greatly from Hydrogen to
Uranium.…read more

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Electron Orbits
On this scale, neither
nucleus nor electrons can
be seen.…read more

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Electron Orbits
n=4 n=5
Niels Bohr gave each orbit
a number, where n=1
identifies the innermost
orbit.…read more

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Electron Orbits
n=4 n=5
These orbits correspond to
different amounts of
energy. Electrons can only
occupy these allowed
orbits.…read more

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Electron Orbits
n=4 n=5
So this orbital diagram can
be redrawn as a more
convenient Energy Level
Diagram.…read more


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