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Electromagnetic Spectrum

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Courtney Bergstrom

on 2 April 2014

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Transcript of Electromagnetic Spectrum

The Electromagnetic Spectrum
Arrangement of electromagnetic waves formed as a result of fusion in stars
Gamma Rays
Smallest wavelength
Kills living cells
Most energy
Generated in a variety of ways
Radioactive atoms
Nuclear Reactions
Hottest regions of the universe
Neutron Stars
Black holes
Not able to pass through
Earth's atmosphere
Small wavelengths
High energy
Allows us to "see" our body
Bones and teeth are more
dense and absorb x-rays
Do NOT pass through
our atmosphere
Emitted by
Black Holes
Neutron Stars
Binary Star Systems
Supernova Remnants
Invisible to the human eye
Most are blocked by atmosphere
You're worth protecting
UV rays are produced by
the hottest, most active
objects in space
Including our Sun!
Some reach
Earth's surface
Studied above
Earth's atmosphere
Visble to some insects
like bumblebees
no, no, no, not that bumblebee
this bumblebee
Visible Light
the only electromagnetic
waves we can see
White Light = Collection of Wavelengths of Different Colors
Red has the longest wavelength
Violet has the shortest wavelength
When we see color,
we see the color
of the light reflected
Which would you want to wear
on a hot summer day?
Visible light is emitted by fireflies, light bulbs, stars
and fast-moving particles hit
by other particles
Used to learn about a star's composition and temperature
Infrared Rays
Felt as heat
Shorter IR rays are used by T.V. remote control
(Do NOT produce heat)
Warm-blooded animals
radiate infrared rays
Pit vipers use sensory "pits"
to image infrared and detect prey
Used to study Earth's surface, cloud structures and map dust between stars
Restaurants use special
IR lamps to heat food
Orange areas = Warmest
White/Blue areas = Coldest
Radio Waves
Longest Wavelengths
can be as long a football field
...or as short as a football
Carries Signals
Cell Phones
Radio waves are emitted by
Clouds of gas
Clouds of dust
Astronomers learn about the composition, structure and motion of space objects
There is an advantage to studying radio waves from space, can you guess what it is...
Observations are not affected by rain, sunlight or clouds
Can penetrate haze, light rain, snow, clouds and smoke
Are good for
transmitting information
Shorter microwaves are used in Doppler Radar for weather forcasting
Used to observe Earth from space
We can observe sea ice breaking off the shores of Alaska
Longer microwaves are used to heat our food
are part of the radio wave portion of the spectrum
Full transcript