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It's all about energy levels...
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<font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#FFFFFF"><strong>Photons:</strong> It's all about energy levels</font>
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<td><font face="Verdana, Arial, Helvetica, sans-serif" size="4"><font face="Verdana, Arial, Helvetica, sans-serif" size="4">The reason everything slowed down on the previous page is that the photons were leaving the container. <strong>Photons are little "wave packets" of light, and light is a form of energy. </strong>When the photons leave, each one carries away a certain amount of energy -- the energy it took to excite the atom in the first place -- so the system loses energy and the atoms slow down.
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<font face="Verdana, Arial, Helvetica, sans-serif" color="#5d6b86" size="5"><strong>What
you will do: </strong></font>
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<font face="Verdana, Arial, Helvetica, sans-serif" size="4">In physics, if
things work one way they usually work in reverse. So if atoms can emit
photons, it's a logical guess that they can absorb them, too! Let's see:
run the model and observe what happens. </font>
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<font face="Verdana, Arial, Helvetica, sans-serif" size="4">Did you notice
that the brown atom gets excited by these photons but the yellow atom
doesn't? Do you know why? Can you change the yellow atom so that it will
get excited too? Try it first without clicking on the Hint button. If you
mess things up, hitting Reset will get you back to normal. </font>
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Remember that the energy levels of the atoms are editable.
<p>
You can change either the excited state or the ground state.
<p>
See if you can get the yellow atom to absorb photons by changing only its ground state.
Hint
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<font size="4">What did you have to do to get these photons to excite the
yellow atom?</font>
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<font face="Verdana, Arial, Helvetica, sans-serif" size="4">What do you
think will happen if you change the energy diagram of the brown atom? What
happens if you change both the ground state and the excited state? What if
you add energy levels to the atoms? There's only one way to find out.
Experiment and see! </font>
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