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Photons come in different colors!
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In the model below we've introduced two new kinds of atoms, purple ones and green ones, plus a blue atom that you can steer with the arrow keys. The atoms have different energy levels, too. Hit "Run" and use the blue atom to excite the green and purple ones. Observe the different photons that they emit.
Did you notice that it was much easier to excite the green atoms than the purple ones? Also, the photons are different: the purple atoms emit blue photons, but the green atoms just emit wiggly lines.
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<b><font size="5" face="Trebuchet MS">Photons come in different colors!</font></b>
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<body face=Verdana><font size =4> Why do you think the purple and green atoms emit different kinds of photons?
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<body face=Verdana> <font size = 4> Why is it so hard to excite all the atoms?
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