Section 1
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what color ink is used in jet printers to produce a full range of colors
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Date created
Mar 1, 2020
Cards (113)
Section 1
(50 cards)
what color ink is used in jet printers to produce a full range of colors
all of the secondary colors
radio waves travel at the speed of...
speed of light
rods
responsible for seeing objects
what is the difference between a gamma ray and an infrared wave?
the frequency and wavelength
light on transparency
can see straight through
what are the similarities and differences between radio and light waves?
similarities: speed differences: wavelength and frequency
magenta
red + blue
rods and cones are connected to?
optical nerves
light on translucent
can see through object, but not clearly
blind spot
spot in the eye that optical nerves are not connected to either rods or cones
wavelength for electromagnetic spectrum
radio waves (10^6m) - gamma rays (10^-12m)
cones
responsible for color vision
are wavelengths of radio and television signals longer or shorter than waves detected by the human eye?
longer
yellow + blue =
white
three kinds of cones:
red, green, blue
which has the longest wavelengths? - light waves, x-rays, radio waves
radio waves
Maxwell
light as a wave
light is what type of wave?
transverse wave
umbra
complete shadow
how do we see color?
excitement of rods and cones that send signals to the brain
electromagnetic spectrum
range of all possible frequencies
example of translucent object
wax paper, lamp shade, unclear glass
addition of colors
you need more than one source
cyan
green + blue
green + _____ = white
magenta
why do we not list black and white as colors?
black is the absence of all colors white is the presence of all colors
shadow
when a light is casted on an object it creates a shadow
long to short wavelengths on spectrum
radio is long - gamma ray is short
why is the sky blue?
scattering of short wavelengths
solar eclipse
when the moon is between the sun and the earth
what generates an electromagnetic wave?
electric field and magnetic field
what is color?
is physiological sensation of the brain in response to the light excitation of cones in the retina
adding all primary colors, and all secondary colors together
creates white light
example of opaque object
brick, wood almost everything we see
example of transparency
clear glass, transparency, clear water
yellow
red + green
what color of visible light has the longest and shortest wavelength?
red has longest, blue has shortest
light does not need what to travel?
a medium
which has shorter wavelengths? - ultraviolet or infrared
ultraviolet wave
penumbra
partial shadow
lunar eclipse
when the earth is between the sun and the moon
four properties of waves
interference reflection refraction polarization
frequency for electromagnetic spectrum
higher frequency at radio waves (10^4) - lower frequency at gamma rays (10^24)
secondary colors
yellow, cyan. magenta
light on opaque object
cannot see through object at all
Debroglie
light as a particle
color triangle
red + cyan = white blue + yellow = white magenta + green = white
why does a white pice of paper appear white in white light, red in red light, and blue in blue light?
all other colors are absorbed when the same colors hit
light as a particle
photon scattering of light
Rayleigh scattering
scattering of light
Section 2
(50 cards)
excitation
in order to excite an atom: -heat -electric current are needed
an eclipse occurs when
the moon is between the sun and the earth, and the earth is between the sun and the moon
subtraction of cyan
cyan (blue + green) + red = black cyan (blue + green) + white = cyan cyan (blue + green) + blue = blue
three types of mirrors
plane mirror, concave mirror, convex mirror
hologram means
complete message or complete picture
real image
when light rays ACTUALLY INTERSECT each other
TF? light travels fast in glass then in water
false
in order to have diffraction
there must be an object in the way
index of refraction
speed of light depends on optical property
laser
device that produces high intensity light l- light a- amplification by s- stimulated e- emission of r- radiation
fluorescence if made up of
mercury vapor (creates uv light)
to correct farsighted eyes, one must use a
convex lens
what color would red cloth appear of it were illuminated by cyan?
red + cyan (blue + green) = dark
when you add magenta and green light, you get a white light. these two colors are?
complementary colors
examples of emission
mercury, neon, hydrogen, helium
who invented the laser?
Maiman in 1960
speed of light in air (vacuum)
C= 3*10^8 m/s
example of phosphorescence
glow in the dark objects
three types of spectra
continuous emission absorption
cool white fluorescence
is what we see everywhere, the whole range of visible light
convex mirror
produces only virtual image
reflection deals with two kinds of images
real image virtual image
diffraction, wavelength
the longer the wavelength, the more spread out the light is going to be. the shorter the wavelength, the more concentrated the light will be
definition of hologram
is a photographic method that produces a three dimensional image that has virtually all of the optical properties of the scene
laser light (four things)
1. coherent: photons depend on each other 2. high energy (intensity) 3. single wavelength 4. single direction
the higher the index of refraction the speed of light...
higher the index of refraction the speed of light slows down lower the index of refraction speed of light speeds up
in the electromagnetic spectrum, which one has higher frequency?
ultraviolet light
diffraction
the spreading of light though an opening or around an obstacle
virtual image
light rays APPEAR TO INTERSECT each other, in reality it is not there
reflection is a property of what
light
subtraction of magenta
magenta (blue + red) + red = red magenta (blue + red) + white = white magenta (blue + red) + blue = blue
polarization
preferential orientation of light
thin-film interference
some of the light reflects and some refracts though it
speed of light in gas, liquid, solid
speed of light slows down gas> liquid> solid
index of refraction of air, water, glass, diamond
air (vacuum): 1 water: 1.33 glass: 1.55 diamond: 2.42
continuous spectra
rainbow, sunlight
emission
hot gas with low density
fluorescent is a mixture of both
emission and continuous
which has the greatest energy, visible light, uv light, or photon of infrared light?
uv light
plane mirror
light comes in, hits and reflects back - always produces virtual image
subtraction of yellow
yellow (red + green) + red = red yellow (red + green) + white = white yellow (red + green) + blue = dark
polarization only happens for
light waves
absorption
mostly in organic compounds
concave mirror
produces real and virtual image
looming
type of mirage observed when warm air lies above cooler air - caused by atmospheric refraction downwards
mirage
caused by total internal reflection of light at layers of air of different densities
usage of lasers
medicine, military, music
phosphorescence
when excited light is "stuck" a delayed fluorescence
warm white fluorescence
when using different phosphor
why is water blueish green?
long wavelengths are absorbed by the water, shorter wavelengths are reflected (blue is a shorter wavelength)
Section 3
(13 cards)