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Tuning up Photons
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<font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#FFFFFF"><strong>Energetic States and Photons:</strong> Tuning up photons</font>
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<td><font face="Verdana, Arial, Helvetica, sans-serif" size="4"><font face="Verdana, Arial, Helvetica, sans-serif" size="4">On the previous page you found out that you could "tune" an atom's energy levels so that the atom would absorb photons of a certain frequency. Now we're going to try that process in reverse. In the model below we've added a slider that let's you change the frequency of the photons that come in. We're also showing you the energy level diagrams of the two kinds of atoms (which are the same as the ones on the last page).</font></td>
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<font face="Verdana, Arial, Helvetica, sans-serif" color="#5d6b86" size="5"><strong>What
you can do: </strong></font>
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<font face="Verdana, Arial, Helvetica, sans-serif" size="4">When you run
the model the photons will excite the brown atom but not the pink atom.
Change the frequency of the photons and see if you can find a setting that
will excite the pink atom. Take a snapshot when you succeed. </font>
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<p>The yellow atom's energy levels are further apart than the brown atom's so <br>the photons will have to have more energy to excite the yellow atom.
<p>
The energy of a photon is proportional to its frequency. Higher frequency <br>photons have more energy than lower frequency ones.
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<font face="Verdana, Arial, Helvetica, sans-serif" color="#5d6b86" size="5"><strong>Think
about it:</strong></font>
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<font face="Arial, Helvetica, sans-serif" size="4"><strong>As you change
the frequency of the photons, what changes do you observe <i>in the
photons themselves?</i></strong></font>
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<font face="Arial, Helvetica, sans-serif" size="4"><strong>How did you
change these photons so that they would excite the pink atom?</strong></font>
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<font face="Arial, Helvetica, sans-serif" size="4"><strong>There is one
big difference between atom-atom collisions and photon-atom collisions. In
a collision between atoms one of them may become excited as long as the
energy available is greater than some minimum, but a photon has to have
exactly the right energy in order to excite an atom: too much energy is
just as useless as too little. Why do you think this is?</strong></font>
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