Physics ch. 28
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 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
When blue and yellow paints are mixed together, the result is green. The reason for that is
Between blue and yellow pigments, all colors are absorbed except green
A photograph of your favorite persons yellow sweater shows as what color on the nagative
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 assortment of tiny particles that scatter all colors
The color of an object we see is determined by the?
Colors of light reflected by the object Frequencies of light absorbed by the object Colors of light shining on the object Frequencies of light reflected by the object
A sheet of red paper will look black when illuminated with
Cyan light
True/False Some electrons in atoms vibrate at a characteristic frequency that produces white light.
False
True/False The sky is blue because air molecules absorb blue light
False
True/False Two colors of light that add together to form black light are called complementary colors
False
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
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 from clusters, scattering different colors of light
Complementary colors are two colors that
Produce white light when added together
The cyan color of ocean water is evidence that water absorbs
Red
Magenta light is really a mixture of
Red and blue light
The colored dots that make up the color on the tv screens are
Red, blue, green
The three primary colors of light for additive color mixing are
Red, green, blue
If the atmosphere were 50 times thicker than it is now, 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
Spectral lines in a line spectrum take the shape of lines because
Slit of the spectroscope is itself a line opening
If you're looking for an instrument that tells what stars are made of, look for a
Spectroscope
Colors seen on a photograph result from color
Subtraction
Light shines on a pane of green glass and a pane of clear glass. The temperature will be higher in
The green glass
Sunsets are red because?
The longest path of sunlight through the atmosphere is at sunset or sunrise A lot of high-frequency light is scattered by the atmosphere Blue light from the sun is scattered by Earth's atmosphere
If an object were completely black, you wouldn't be able to see it directly
True
Tennis balls are yellow-green because our eyes are more sensitive to that color
True
True/False Material in an object that selectively absorbs colored light is called pigment
True
True/false A spectroscope is an instrument that analyzes the colors in a light beam
True
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 it's color is
Yellow-green
Humans are most sensitive to light that is
Yellow-green