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Modern Physics
2
Transcript
Bombarding Atoms with Photons
Energy of a photon
An Atom which absorbs a photon
gains energy
Ex. 3.4
History of the Atom
Thomson
Rutherford
Bohr
Light Emission
photon
E =
E =
photon
E = E - E
photon initial final
1
13.6 eV
2
initial
_____ _ _____
[ ]
(-13.6 eV) (-13.6 eV)
n n
Ex. 3.2
1 1
n n
____ _ ____
2
final
2 2
fin ini
[ ]
History of the Atom
Bohr's Model of the Atom
Excitation of Atoms
|
n= 1, 2, 3...
Radius:
Energy:
Electrons in atoms can exist only in
certain fixed orbits around the central nucleus
Thanks for
your Attention!
By:
Alejna Qazimi
Edona Ramadani
Bohr's 1st Postulate
Other Atoms
n
E =
-10
n
r = (0.53 x 10 m)
(-13.6 eV)
Atomic
Excitation
Frank - Hertz
Experiment
n
Z
|
Z
n
2
2
2
2
Ex. 3.1
Energy:
n
E =
2
-13.6 eV
n
|
Radius:
n = 1, 2, 3
During the transition of an electron from a high orbit to a low one, the energy difference is released as a photon
Hydrogen atom
Bohr's 2nd Postulate
|
hc
y
= E - E
n 1
h
2π
n
L=mvr = n
final
initial
hf = E - E
r = a n
2
n 0
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