Color Notes

Cool, you made it!

Using your note packet, fill in your notes through color, dyes, and pigments. We won't cover all the notes today- I will be back later this week to finish them up with you. There's a few progress checks in here along the way. Let's get started!

Colors, Dyes and Pigments

Light Waves

Light

● We see objects because light is either

emitted or reflected by the object

Light

● Light is an electromagnetic wave that the human

eye can detect

● Light has wavelengths that range from 400 nm

(violet) to 700 nm (red)

● The speed of light is 3 E 8 m/s

Equations

● c = λ f

● c = speed of light (3 E 8 m/s)

● λ = wavelength

● f = frequency

​Distance = velocity x time
D= vt

Math Response

How long does it take for the sound of the starter's gun at a track meet to reach the timers standing 686 m away? The sound is travelling at 343 m/s.

Type answer here

Correct Answer: 2

Deg^°

Rad

Math Response

How long does it take for the LIGHT of the starter's gun at a track meet to reach the timers standing 686 m away? The light is travelling at 3 x10^8 m/s. Answer in scientific notation, 1 decimal point.

Type answer here

Correct Answer: 2.3\times10^{-6}

Deg^°

Rad

Open Ended

Why should timers start their watches on the light of the gun instead of the sound?

Math Response

Find the frequency of red light if it has a wavelength of 4.25 x 10^-7 m.

Don't forget the speed of light is 3 x 10^8 m/s. Answer in scientific notation, 1 decimal point.

Type answer here

Correct Answer: 7.1\times10^{14}

Deg^°

Rad

Luminous Body

● A luminous body

emits light waves

● Ex: the sun

Illuminated Body

● An illuminated body

reflects light waves

● Ex: the moon

Luminous Flux (P)

● Luminous Flux is the rate at which light is

emitted from a source

● It is measured in lumen (lm)

Illuminance (E)

● Illuminance is the amount of light that is

reflected

● E = P
4πd²

● Units are lm/m2 or lux (lx)

● E = illuminance

● P = luminous flux

● d = distance

Transparent

● Transparent materials

transmit light without
distortion

● Ex: crystal clear water

Translucent

● Translucent materials

transmits light but the
image is distorted

● Ex: lampshade

Opaque

● Opaque materials

transmit no light

● All light is absorbed or reflected.

● Ex: brick

Categorize

Options (9)

No light passes through

A brick wall is an example

A piece of cardboard is an example

Some light passes through with distortion

A lampshade is an example

Stained glass is an example

All light passes through

Clear water

Clean glass

Match the examples and traits to the right type of materials!

Transparent

Translucent

Opaque

White Light

● White light is produced by adding the colors red,

blue and green

● This is called the additive process

● Red, blue and green are called the primary light

colors

Mixing Light Colors

● Red and Green =

● Blue and Green =

● Red and Blue =

● Yellow

● Cyan

● Magenta

Complementary Light Colors

● Yellow and Blue

● Cyan and Red

● Magenta and Green

ALL Produce white light

​Why? Because all of these combinations result in red, blue, and green being mixed together.

Dyes and Pigments

● Dyes are molecules that dissolve in liquids

to form colored solutions. They absorb certain wavelengths and reflect others.

● A pigment also absorbs certain wavelengths

and reflect others, but they
are larger and mix to form suspensions.

Dyes and Pigments

● The absorption process of light forms colors by

the subtractive process

Primary Pigments

Absorb one color from white light and reflect 2 colors

● Yellow absorbs Blue

● Magenta absorbs

Green

● Cyan absorbs Red

● Reflects red and Green

● Reflects Blue and Red

● Reflects Blue and Green

​If a color is absorbed, we WON'T see it!
Only reflected colors will be seen.

Secondary Pigments

Absorb 2 colors from white light and reflect one color

● Red absorbs Green

and Blue (Cyan)

● Green absorbs Red

and Blue (Magenta)

● Blue absorbs Red and

Green (yellow)

● Reflects Red

● Reflects Green

● Reflects Blue

Complementary Pigments

● Complimentary pigments produce black

light

● Black is not a color just the absence of

light

● No light is being reflected

● Note: The primary light colors are the

secondary pigments and vice versa

Multiple Choice

What color would a yellow banana appear if it were hit green light?

• Cyan!

• Red!

• Green!

• Yellow!

Multiple Choice

What color would a yellow banana appear if it were hit with blue light?

• Black
• Green
• White
• Purple

Multiple Choice

What color would a yellow banana appear if it were hit with cyan light?

• Blue
• Black
• Red
• Green

Open Ended

Do you have any questions you want me to answer/go over when I come back? Or anything else you want to ask/tell me?

Great Job! You made it to the end.

Later this week I will go over any questions you might have and continue the notes in person with you. See you soon.
-Coach Bush