The electromagnetic spectrum is the collective name for all types of
radiation. Radiation is energy that travels around in waves. The
electromagnetic spectrum goes from the waves with the lowest energy to
those with the highest energy.
Radio waves have the longest wavelengths in the electromagnetic
spectrum. They can be from as long as a football to as long as a
football pitches. Radio waves carry signals from devices from one
place to another invisibly through the air.
Radio waves are used for many different jobs:
b In Medicine - radio waves are used to transmit the pattern of a
heartbeat through a monitor at a patient's home to a nearby hospital.
They are also used to radio the condition of a patient from an
ambulance to a hospital. Radio waves are used in medicine when
paramedics are dispatched to the scene where they are needed. The
hospital can tell the paramedics the condition of the person so that
the paramedics can prepare a medical treatment kit.
b In Industry - used mainly in the transportation business. Radio
waves can also be used to provide communication on construction sites.
b In Science - radio waves from outside the earth are detected using
in radio telescopes. Radio waves are picked up when they hit the
antenna of the radio telescope. The wave then goes to the tuner, then
to the amplifier, and finally to the plotter.
b For Consumer Goods - these waves are used in the remote control
models which people buy. They are also used in radios, televisions and
wireless headphones. The antennae on your television set receive the
signal, in the ...
... middle of paper ...
...nd are produced by
the hottest regions of the universe. Things like supernova explosions
(the way massive stars die), neutron stars and pulsars, and black
holes are all sources of gamma rays.
Unlike optical light and X-rays, gamma rays cannot be captured and
reflected in mirrors. The high-energy photons would pass right through
such a device. So gamma ray astronomy took along time (in comparison
to other forms of astronomy) to develop.
If you could see gamma rays, the night sky would look strange and
This gamma ray moon picture just looks like a round blob - lunar
features are not visible. In high-energy gamma rays, the Moon is
actually brighter than the quiet Sun.
We are still discovering more about gamma rays and they are the most
unknown waves of the electronic spectrum.
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