Physics Chapter 28 Flashcards
List the order of colors in the color spectrum.
Red, orange, yellow, green,
indigo, violet
Are black and white real colors, in the sense that red and green are? Explain.
No, black is the absence
of light and white is a
combination of all the colors
of light.
What is emitted by the vibrating electrons of atoms?
light
What happens to light of a certain frequency that encounters atoms of the same resonant frequency?
It is absorbed
Why does the color of an object look
different under a fluorescent lamp from the
way it looks under an incandescent lamp?
Incandescent light—more
lower frequencies;
fluorescent—more higher
frequencies
a. What color(s) of light does a transparent red object transmit?
b. What color(s) does it absorb?
a. Red
b. Non-red colors
What is the function of a pigment?
Pigments absorb light of
specific colors.
Why are more and more fire engines being
painted yellow-green instead of red?
The human eye is most
sensitive to yellow-green.
How can yellow be produced on a screen
if only red light and green light are available?
Overlap the red and green.
What is the name of the color produced
by a mixture of green and blue light?
Cyan
What colors of spots are lit on a television tube to give full color?
Red, green, and blue
What are complementary colors?
Two colors that when added
produce white
What color is the complement of blue?
yellow
The process of producing a color by
mixing pigments is called color mixing by
subtraction. Why do we say “subtraction”
instead of “addition” in this case?
Pigments absorb or “subtract”
colors from light.
What colors of ink are used to print fullcolor pictures in books and magazines?
Cyan, yellow, magenta, black
