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An excited atom can give up its stored energy in a collision
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<font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#FFFFFF"><strong>Photons:</strong> An excited atom can give up its stored energy in a collision.</font>
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<td><font face="Verdana, Arial, Helvetica, sans-serif" size="4">You have learned that atoms can have two kinds of energy: kinetic energy due to their motion and a special kind of potential energy if they are in an excited state. These two kinds of energy are interchangeable: they can be swapped back and forth. So if two atoms crash into each other one or both of them might be excited and then the two atoms will move more slowly after the collision. In that case the energy has been converted from kinetic energy to the potential energy of the excited atoms.
<P>
The opposite process can happen too: an excited atom can give up its stored energy in a collision with another atom and the energy released will make them both move faster. When this happens the potential energy is converted to kinetic energy.</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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<img height="6" width="18" src="rule.png">
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<font face="Verdana, Arial, Helvetica, sans-serif" size="4">In the model
below we've added two more purple atoms. We've also made the green atom
steerable, meaning that when you press the arrow keys on the keyboard you
will push it left, right, up, or down. </font>
<p>
<font face="Verdana, Arial, Helvetica, sans-serif" size="4">1.) First
try to get all the purple atoms into the excited state. When you
succeed, stop the animation and take a snapshot.<br><br>2.) Then try to
de-excite them all back to the ground state and take another snapshot
when you succeed. This task is much harder than exciting them; if you
want help, press the Hint button.</font>
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When you push on the steerable atom you either speed it up or slow it down.
This adds or subtracts energy from the system of atoms.
<p>
The more energy you add the more likely you are to excite the atoms.
If you take away energy the atoms will go back to the ground state.
Hint
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Create my report
My Report for Energetic States and Photons, Part I
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