EM Spectrum Flashcards
EM Spectrum order (longest wavelength -> shortest)
Radio -> Microwave -> Infrared -> Visible -> UV -> X-ray -> Gamma rays
Radio waves uses
communication, remote controls, MRI
machines
Microwaves use
cell phones (and other
communication), cooking food, radar
Infrared uses
thermal imaging
Visible Light uses
human vision
Ultraviolet uses
sterilizing surface equipment, vitamin D
production
X-Ray uses
medical diagnoses, cancer therapy (and causes),
security (airport)
Gamma Ray uses
medical diagnoses, cancer therapy (and
causes),
What do the numbers on the radio dial represent?
The numbers on your radio dial represent frequencies used by
your local radio stations.
Why can you see your reflected image in a mirror, but not in a
smooth wall?
The very small bumps on the wall don’t allow the light to
perfectly reflect how it needs to in order to form a clear image.
The light rays scatter too much to produce an image.
Transparent
a material that allows almost all light to pass
through, where objects can be seen clearly (light not scattered)
Translucent
a material that allows some light to pass through,
where objects appear blurry (scattered light)
Opaque
a material that does not allow light to pass through, and
objects cannot be seen through it. All light is either absorbed or
reflected.
Black objects
-absorb all colors, so no light is reflected back to your
eyes.
White objects
reflect all colors
