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Spectroscopy: Introduction
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<strong><font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#FFFFFF">Spectroscopy:</font></strong><font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#FFFFFF">
Introduction</font>
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<font face="Verdana, Arial, Helvetica, sans-serif" size="4">Spectroscopy
is the science of identifying atoms and molecules by the light they
emit. By examining the light emitted by a substance, scientists can
determine what kind of atoms are present, even if they can't observe
them directly. </font>
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<strong><font face="Verdana, Arial, Helvetica, sans-serif" size="5" color="#5d6b86">Frequency
and color</font></strong>
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The color of light is determined by its frequency. The lowest
frequency light <b>we can see</b> looks red, the highest frequency
looks violet. Light frequencies lower than red are called infrared.
We can't see infrared light but we can feel it as heat. Frequencies
just a bit higher than violet are called ultraviolet. We can't see
that either, but it's what makes our skin tan when we go out in the
sun.
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Photons are particles of light. Each photon carries energy. The
higher the frequency of the light, the more energy the photon
carries. So, for example, blue photons carry more energy than yellow
ones. In the following model, you will see different photons with
different colors and frequencies.
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<b>Run the model.</b><br>Change the intensity of the light source and the
frequncy of the light source.<br><b>Important Note:</b><br>Invisible
photons such as infrared and ultraviolet are shown as black dashed
squiggles. Visible photons are shown in the colors that correspond to
their frequencies.
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You may notice that, unlike atoms, all photons move with the same speed --
the speed of light -- in the same medium, regardless of their frequencies.
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<strong><font face="Arial, Helvetica, sans-serif" size="4">What color
light has the highest frequency?</font></strong>
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Red
Yellow
Green
Blue
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<strong><font face="Arial, Helvetica, sans-serif" size="4">Which photon
has the lowest amount of energy?</font></strong>
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Infrared
Orange
Violet
Ultraviolet
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