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Different atoms require different amounts of energy to get excited
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<font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#FFFFFF"><strong>Photons:</strong> Different atoms require different amounts of energy to get excited.</font>
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<td><font face="Verdana, Arial, Helvetica, sans-serif" size="4"><strong>The answer to where the energy went is that it is stored in the excited atom. </strong>You've already learned about atomic orbitals so you know that atoms have a "ground state" and at least one "excited state." It takes energy to move an atom from the ground state to an excited state. That energy is stored when one of the atom's electrons changes from one orbital to another.
<P>
In the experiments you've been doing, the energy to excite the target atom was provided by converting the kinetic energy of the moving atom -- if there wasn't enough kinetic energy the atom wouldn't excite.<P>The minimum speed at which a moving atom can excite a stationary one is called the <strong>threshold
</strong>for excitation. Different atoms have different thresholds.
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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">Below are
two new kinds of atoms. Find the threshold for excitation for each kind
of atom and answer the questions below. </font>
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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>What is the
threshold for excitation of the brown atom? </strong></font>
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800 m/s
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<font face="Arial, Helvetica, sans-serif" size="4"><strong>What is the
threshold for excitation of the yellow atom?</strong></font>
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1600 m/s
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