Conceptual Physics Chapter 28 Color

Define pigment

A Pigment is a material in glass that selectively absorbs colored light

Color of cloud with lots of water droplets.

A cloud containing many large water droplets appears dark.

Water molecules absorb certain frequencies of colored light. What is the complementary color to the color that is absorbed?

Cyan

How is the frequency of a photon related to the energy change in an atom?

Frequency is directly proportional to the energy change.

If white light shines on a mixture of blue and yellow paint, what color is not absorbed?

Green

Magenta's complementary color

Green

Explain how a color television produces a wide range of colors on it's screen.

Groupings of spots of red, blue, and green cover the screen. Varying how much each color spot is illuminated in each grouping, different colors are formed.

Describe what happens when the frequency of the light shining on an object is higher or lower than the objects natural frequency.

It Reemits light

Describe what happens when the frequency of the light shining on an object resonates with the objects natural frequency.

It absorbs light

What determines the color of a transparent object?

It's the color of the light it transmits.

What is a spectroscope?

A spectroscope is an instrument used to analyze the light emitted by glowing elements.

Define spectrum

A spread of colors

After reaching an excited state...

An atom emits a photon and then returns to its normal state.

Define Excited State

An energy level greater than an atom's lowest energy state is known as an excited state.

Opaque objects color

An opaque object is the color it reflects.

As the path of sunlight through the atmosphere increases, what color of light is scattered more?

Blue

Yellow's complementary color

Blue

What colors are absorbed by yellow paint?

Blue and violet

Define White light

Color produced when red, blue, and green light of equal brightness overlap.

Subtractive primary colors

Magenta, yellow, and cyan are the subtractive primary colors used in printing illustrations in full color.

What is the brightest portion of the spectrum of sunlight?

Middle of the visible range/the yellow green region

Define Cyan

Mix of green and blue

Define Magenta

Mix of red and blue

Define Yellow

Mix of red and green

What did newton find and study in his observations?

Newton studied sunlight, he passed sunlight through triangular shaped pieces of glass, and he observed that sunlight was broken into a rainbow like pattern of colors.

Although violet light is scattered more than blue light, our eyes see the sky as blue. Explain.

Our eyes are more sensitive to bluelight then to violet light, so we see the sky is blue.

Color of light that is scattered the least as it passes through the atmosphere.

Red

Cyan's complementary color

Red

What is the color water molecules absorb?

Red

Additive Primary Colors

Red, blue, and green light are known as the additive primary colors.

What colors are absorbed by blue paint?

Red, orange, and yellow

List the colors of the visible spectrum in the correct order

Red, orange, yellow, green, blue, Violet

Describe how the color of the sky changes as more and more high frequency light is scattered.

Sky becomes progressively redder, going from yellow to orange

What is the light that results when a color is subtracted from white light?

The complementary color to the subtracted color

Define Radiation Curve

The graphical distribution of brightness versus frequency in sunlight is called the radiation curve.

Is the following sentence true or false? At sunset, only lower frequency light strikes Earth.

True

Is the following sentence true or false? Atoms and molecules can behave like optical tuning forks, remitting light waves that shine on them.

True

Is the following sentence true or false? By mixing red, blue, and green light and adjusting the brightness of each, virtually any color can be formed.

True

Is the following sentence true or false? Different sources of light produce light made up of different frequencies.

True

Is the following sentence true or false? Sunlight is a combination of all colors.

True

Is the following sentence true or false? Water is transparent to nearly all the frequencies of white light.

True

Is the following sentence true or false? When made to emit light, each element has its own unique color.

True

True or false? Different materials have different natural frequencies for absorbing and emitting radiation.

True

White object appears white when illuminated by white light. True or False?

True

Define complementary colors

Two colors of light that once added together produce white, are known as complementary colors

What does energy do to glass?

Warms the glass

Isaac newton

Was the first person to do a systematic study of color

Explain this statement: White and Black are not actually colors.

White is a combination of all the colors. Black is the absence of light.

What does each line in a line spectrum represent?

Each line corresponds to a distinct frequency of light emitted by the atom.

What determines the colors emitted by an atom?

Energy levels of its electrons.

Is the following sentence true or false? At sunset, light reaches Earth surface through a shorter path than at noon.

False

Is the following sentence true or false? Black objects that you can see absorb all the light that falls on them.

False

Is the following sentence true or false? Human vision is most sensitive to colors in the red-orange part of the visible spectrum.

False

Is the following sentence true or false? The brightness of sunlight is directly proportional to frequency.

False

Is the following sentence true or false? The deep-blue color of a pond or an ocean is due to the color of the water itself.

False

Is the following sentence true or false? The mixing of colored paints yields similar results as mixing the same colors of light.

False

Is the following sentence true or false? The presence of water droplets in the atmosphere does not affect how much light is scattered or what frequencies of light are scattered.

False

Is the following sentence true or false? The sky appears blue because particles in the atmosphere scatter low-frequency light.

False

Is the following sentence true or false? The spectrum emitted by an excited atom is continuous.

False

Is the following sentence true or false? When an object reemits the light that shines on it, absorption occurs.

False

The following sentence true or false? The amount of scattering that occurs at sunset varies very little from day to day.

False

Describe the process used to print a color image in a book.

Four different links, magenta, yellow, Cyan, and black, are used. Each color is printed on its own color plate. Each plate produces a series of ink dots on the page, the result of which gives the appearance of a wide range of colors.

Color by Subtraction

The mixing of pigments, paints, or dyes is known as color mixing by subtraction.

Explain what happens when paints or dyes are mixed

The mixture absorbs all the frequencies each paint absorbs.

Define scattering

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

Describe what occurs when many particles larger than oxygen and nitrogen molecules are in the atmosphere.

The sky appears whitish.

Describe the relationship between the size of a particle in the atmosphere and the frequency of the light it scatters.

The tinier the particle, the higher the frequency of light it will scatter.

Explain why many clouds appear white.

They contain water droplets with a wide range of sizes. These droplets scatter a wide range of frequencies to produce a white looking cloud.

What explains why cells containing chlorophyll are green?

They reflect green light.