UTF-8
Excitation and deexcitation: Day 1, P1
Atoms Can be Excited (and Exciting!)
Different atoms require different amounts of energy to get excited.
1
16true
1
16true
1
16true
16
1
20.0
20.0
4.0
20.0
20.0
4.0
org.concord.modeler.PageTextBox
800.0
300.0
<html>
<head>
</head>
<body>
<font size="5"><b>The answer to where the energy went is that it is stored
in the excited atom. </b>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
(it's usually only one) changes from one orbital to another. </font>
<p>
<font size="5">In the experiments you've been doing, the energy to
excite the stationary atom was provided by converting the kinetic energy
of the moving atom -- if there wasn't enough kinetic energy the atom
wouldn't excite. That's why you couldn't excite the atom at low speeds. </font>
</p>
<p>
<font size="5">The minimum speed at which a moving atom can excite a
stationary one is called the <b><i>threshold </i></b>for excitation.
Different atoms have different thresholds for excitation. </font>
</p>
<p>
<font size="5">Below are two new kinds of atoms. Find the threshold for
excitation for each kind of atom and answer the questions below.</font>
</p>
</body>
</html>
-34
20.0
20.0
4.0
20.0
20.0
4.0
20.0
20.0
4.0
1
org.concord.mw2d.activity.AtomContainer
excitedstatePage2$0.mmlfalse
20.0
20.0
4.0
org.concord.modeler.PageSlider
org.concord.mw2d.models.MolecularModel
0
400.0
0.0
2000.0
20
Top blue atom speed (100 m/s)
200
80
false
true
true
{value="2000.0", label="20"}{value="1800.0", label="18"}{value="1600.0", label="16"}{value="1400.0", label="14"}{value="1200.0", label="12"}{value="1000.0", label="10"}{value="800.0", label="8"}{value="600.0", label="6"}{value="400.0", label="4"}{value="200.0", label="2"}{value="0.0", label="0"}
Execute MW script
org.concord.modeler.PageButton
<html><font size=5><b>Run</b></html>
10050
org.concord.mw2d.models.MolecularModel
0
Execute MW script
org.concord.modeler.PageButton
<html><font size=5><b>Reset</b></html>
11050
org.concord.mw2d.models.MolecularModel
0
Execute MW script
20.0
20.0
4.0
org.concord.modeler.PageSlider
org.concord.mw2d.models.MolecularModel
0
400.0
0.0
2000.0
20
Bottom blue atom speed (100 m/s)
200
80
false
true
true
{value="2000.0", label="20"}{value="1800.0", label="18"}{value="1600.0", label="16"}{value="1400.0", label="14"}{value="1200.0", label="12"}{value="1000.0", label="10"}{value="800.0", label="8"}{value="600.0", label="6"}{value="400.0", label="4"}{value="200.0", label="2"}{value="0.0", label="0"}
Execute MW script
20.0
20.0
4.0
1
20.0
20.0
4.0
org.concord.modeler.PageTextField
240
48
<html>
What is the threshold for excitation of the brown atom?
</html>
8 m/s
800 m/s
org.concord.modeler.PageTextField
240
48
<html>
What is the threshold for excitation of the yellow atom?
</html>
12 m/s
1600 m/s
20.0
20.0
4.0
20.0
20.0
4.0
20.0
20.0
4.0
20.0
20.0
4.0
20.0
20.0
4.0
1
org.concord.modeler.text.LineIcon120.025101015<html><center><b><font face=Verdana size=4><a href="index.cml">Index</a></font></center></html>-ff0067
org.concord.modeler.text.LineIcon120.025101015<html><center><b><font face=Verdana size=4><a href="excitedstatePage1.cml">Previous</a></font></center></html>-9a
org.concord.modeler.text.LineIcon120.025101015<html><center><b><font face=Verdana size=4><a href="excitedstatePage3.cml">Next</a></font></center></html>-3367
11