Chapter 28 (Physics)

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when a sample of an element is heated until it glows, the color it gives off is

a composite of many frequencies of light

the reason the sky is blue is that air molecules

absorb and then reemit blue light, scattering it in all directions

Earth receives a lot of ultraviolet radiation from the sun. Luckily most of it doesn't reach the ground, because it is

absorbed by a protective layer of ozone gas in the upper atmosphere

colors seen on TV result from color

addition

red, green, and blue

additive primary colors

when blue and yellow paints are mixed together, the result if green. the reason for this is that

between blue and yellow pigments, all colors are absorbed except green

a photograph of your favorite person's yellow sweater shows as what color on the negative?

blue

if molecules in the sky scattered orange light instead of blue light, sunsets would be colored

blue

the white caps of waves as they overturn are evidence that the water has

broken into an assortment of tiny particles that scatter all colors

when two colors are added together to produce white

complementary colors

a sheet of red paper will look black when illuminated with

cyan light

a state with greater energy than the atom's lowest energy state

excited state

different colors of light correspond to different light

frequencies

if sunlight were green instead of white, the most comfortable color to wear on a hot day would be

green

the true color of water is

greenish blue

the colors of light emitted by incandescent gases show the

identities of atoms in the gas

a pattern of distinct lines of color with each line corresponding to a frequency of light

line spectrum

the complementary color of green is

magenta

when red and blue light shine on a white sheet, the resulting color is

magenta

the three paint colors that are useful for color subtraction are

magenta, cyan, and yellow

clouds are white because water molecules

of different sizes form clusters, scattering different colors of light

the material in the glass that selectively absorbs colored light

pigment

complementary colors are two colors that

produce white light when added together

the cyan color of ocean waves is evidence that the water absorbs

red

magenta light is really a mixture of

red and blue light

the colored dots that make up the color on a TV screen are

red, blue, and green

the three primary colors of light for additive color mixing are

red, green, and blue

if the atmosphere were 50 times thicker than it now is, the sun would appear

red-orange

the color of an opaque object is determined by the light that is

reflected

the sky is blue because air molecules in the sky act as tiny

resonators that scatter blue light

a process in which sound or light is absorbed and reemitted in all directions

scattering

spectral lines in a line spectrum take the shape of lines because the

slit of the spectroscope it itself a line opening

an instrument that light glowing from elements can be analyzed with

spectroscope

if you're looking for an instrument that tells what stars are made of, look for a

spectroscope

the spread of colors

spectrum

colors soon on a photograph result from color

subtraction

magenta, yellow, and cyan and are used for printing pictures

subtractive primary colors

light shines on a pane of green glass and a pane of clear glass. the temperature will be higher in

the green glass

a combination of all the colors

white light

sunlight contains all colors of light, but much of it is

yellow

the complementary color of blue is

yellow

when red and green light shine on a white sheet, the resulting color is

yellow

a tennis ball is most easily seen if its color is

yellow-green

humans are most sensitive to light that is

yellow-green


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