The Challenge: Make an underwater flashlight
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How can we get
the atoms excited?
One way to get atoms
in a metal excited is by putting an electric current through them. If
you put an increasing current through a piece of metal it will eventually
get red-hot. If you up the current a bit more, it will eventually get
white hot. When a metal is glowing with heat, it is described as being
Why is light given
In a red-hot object,
the atoms are just getting enough energy to begin emitting the light that
we can see. Red is the first visible light to be seen because it is the
color which requires the least energy for emission. Once you apply a
big enough current, you will energize all the electrons to such an extent
that light of all colors is being generated. These colors mix together
to appear white.
How does a light bulb work?