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Physics Chapter 28
Terms in this set (45)
If violet light has a wavelength of 400 nm, what is its frequency?
When red light shines on a red rose, why do the leaves become warmer that the petals?
The leaves absorb the red light and therefore they get warmer.
When green light shines on a red rose, what color do the petals appear? Why?
Black because they are not going to reflect any of the green and they absorb all of the green light.
What is a pigment?
A particle that selectively absorbs different colors of light.
The material in glass that selectively absorbs color.
Why are newer fire trucks sometimes painted yellow-green?
People are more sensitive to yellow-green light.
How would you produce an orange light on a computer screen? How would you produce an orange spot on a printed page?
Mix red and green, using more red than green.
Mix yellow and magenta
What are the additive primary colors? How does additive mixing work?
Red, green, and blue.
Overlap red, green, blue light and adjusting the brightness of each of the colors.
What are the subtractive colors? How does subtractive mixing work?
Magenta, yellow, and cyan.
Start with white and absorb color until you get to black.
On a computer screen, what pixels are activated to produce blue light? How would you make gray appear on a computer screen?
You turn on the blue pixel. Turn it all on, but not so bright.
The color of light that transmits through a piece of transparent red glass is what?
Why don't astronauts see the blue surrounding the earth?
Because its easier to see on a dark background. The light being reflected off of the earth is too bright.
Why do different elements give different atomic spectra? Be through in your answer-- consider what is happening at the atomic level.
Electrons start off near the nucleus and they jump up to a different level and they get excited. When they are excited they give off light and fall back down to the original energy level. Light given off is going to vary in color depending on how far apart the levels are. The levels are going to be different distances apart for each atom, so that's why everyone's different.
Why can't we see a laser beam unless there is fog, chock dust, or mist in the air as the laser beam passes through a room?
The light that is emitted has to reflect off of the particles in the air.
If you had three spotlights that could be filtered each with red, blue, and green filters, how would you make a magenta dress appear to be the brightest? How would you make it appear black?
Shine blue and red at the dress to appear brighter.
Shine only green light at the dress to make it look black.
Why is the light from traditional, tungsten-filament incandescent bulbs yellowish in color? Why do these bulbs get so hot when they are lit? Hint: there is one reason for both of these questions.
Because the peak is in the infrared. It gives off a lot of light at a lower frequency and that lower frequency gives off heat that we cannot see.
Because the peak is in the infrared, it gives off a lot of heat and only yellowish light.
Why are newer fire truck's painted yellow-green?
Because it's more sensitive to the eye.
Why is water greenish blue?
Because the water particles absorb red light.
Why are rainclouds dark, while other clouds are white?
Because the particles are larger.
Why are sunsets red while the sky is blue at noon?
Why are newer fire trucks sometimes painted yellow-green?
Because our eyes are most sensitive to that color
If a white object is placed at the point where a red spotlight and a blue spotlight cross, what color will it appear? What color(s) will its shadows be?
Red and blue shadows.
You are developing film, and you get a negative picture that shows a man with dark blue hair. What is his actual hair color?
What color light would you add to a yellow spotlight to produce a white light?
We seen a green hot star not as green but white, why?
Green is at the peek of the visible light spectrum and that covers all of the colors, so it appears as white instead of green.
Suppose a dyer wants to prepare a black cloth. She has a green piece of cloth to start. What color dye should she add to obtain black?
Why do different elements give different atomic spectrum?
The electrons get excited they give off light with different frequencies and they take in light at different frequencies.
What light is being reflected from a blue notebook? What is being absorbed?
Absorbs: Red and Green (everything that's not blue)
What light is being reflected from a blue notebook? what light is being absorbed?
absorbed: red and green
Why are the interiors of optical instruments painted black?
Because black absorbs everything and so you wont get any stray light inside it.
What are complementary colors?
When two colors are added together to produce white.
Why are clouds white?
They scatter all of the light equally.
What color will a yellow cloth appear when lit by sunlight? Yellow light? Blue light?
If you have the wavelength of light and frequency is proportional to energy, what will happen to the energy of the photons?
It will go up by a factor of two.
What are the subtractive primary colors?
cyan, magenta, and yellow
List the colors of the rainbow in order.
What causes the different colors you see when logs are burning in a fire place?
The temperature and the different gases
When atoms are made to glow, how can you determine their identities?
The frequency that it occurs at
Why are sunsets red?
By the time the sun is setting all you can see is the red particles because red is the slowest.
Are black and white real colors? Explain.
White is not a color, but a combination of all of the colors. Black is also not a color, but the absence of light.
When green light shines on a red rose, what color does the petals appear?
You have three spotlights, a yellow, green, and a blue. You are wearing a magenta colored dress. How would you make it appear black?
When a red light shines on a red rose, why are the leaves warmer than the petals?
Because the green leaves absorb the red light.
What colored light would you add to a yellow spotlight to produce a white light?
Magenta and cyan
When red and green light are overlapped the resulting color is...
What is absorbed by a transparent red object?
Everything except red.
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