by Amos Ching
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This is just a demo map that you can delete right away, if you feel like it...
What is it?
Electromagnetic radiation is generally described as a
self-propagating wave in space with electric and magnetic
components. These components oscillate at right angles to each
other and to the direction of propagation, and are in phase with
electromagnetic radiation can be described in terms of a stream of
photons, which are massless particles each traveling in a wave-like
pattern and moving at the speed of light. Each photon contains a certain
amount (or bundle) of energy, and all electromagnetic radiation consists of
yes, this is the same kind of energy that radio stations emit into the air
for your boom box to capture and turn into your favorite Mozart,
Madonna, or Coolio tunes. But radio waves are also emitted by other
things ... such as stars and gases in space. You may not be able to
dance to what these objects emit, but you can use it to learn what they
are made of.
they will cook your popcorn in just a few minutes! In
space, microwaves are used by astronomers to learn about
the structure of nearby galaxies, including our own Milky
yes, this is the part that our eyes see. Visible radiation
is emitted by everything from fireflies to light bulbs to
stars ... also by fast-moving particles hitting other
we know that the Sun is a source of ultraviolet (or UV)
radiation, because it is the UV rays that cause our skin to
burn! Stars and other "hot" objects in space emit UV
your doctor uses them to look at your bones
and your dentist to look at your teeth. Hot
gases in the Universe also emit X-rays .
X-ray scanner- scans bodies
radioactive materials (some natural and others made by man in things like
nuclear power plants) can emit gamma-rays. Big particle accelerators
that scientists use to help them understand what matter is made of can
sometimes generate gamma-rays. But the biggest gamma-ray generator
of all is the Universe! It makes gamma radiation in all kinds of ways.
Kills cancerous cells