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8th grade Science

Light Waves Unit Final Test

QuestionAnswer
A rug sits in a sunny place on the floor for a long time. Kiara thinks that light from the sun can cause the rug’s color to fade over time. Can light from the sun cause the rug’s color to fade? Yes. The rug can take in energy from the light, causing the rug’s color to fade.
Malachi uses some glue to fix a broken plate. He puts the glue under a desk lamp but the glue doesn’t dry. Then he puts the glue out in the sun and it dries. Why does light from the sun dry the glue when light from the desk lamp does not? Because the glue can take in energy from the light from the sun but not from the light from the lamp.
X-ray light is transmitted through the aluminum. Ultraviolet light is reflected off the aluminum. Which type of light is more likely to heat up the sheet of aluminum? Neither type of light is likely to heat up the aluminum because the aluminum does not take in energy from either the X-ray light or the ultraviolet light.
If lasers have different wavelengths would they give off different types of light? Yes.
Your friends say that they saw a special nail polish that changes color when it is out in the sun. Can light from the sun cause the nail polish to change color? Yes. The nail polish can take in energy from the light, causing it to change color.
Dentists use a soft, clay-like material to make a filling which stays soft under the light of the dentist’s lamp, but it hardens when the dentist shines an ultraviolet flashlight on it. Why does light from the ultraviolet flashlight harden the filling? Because the filling material can take in energy from ultraviolet light, but not from the light from the lamp.
Sunscreen when exposed to ultraviolet light reflected off the sunscreen. When sunscreen was exposed to x-ray light it transmitted through the sunscreen. Based on this information, which type of light is more likely to dry out the sunscreen? Neither type of light is likely to dry out the sunscreen because the sunscreen does not take in energy from either the ultraviolet light or the x-ray light.
Ana wonders how light can affect a mystery material. When exposed to red light or yellow light, it was absorbed by the material. Based on this information, can light change the mystery material? Yes, and the mystery material can change in one or two different ways, such as by getting warm and/or changing color, because different types of light can cause different changes to a material when they are absorbed.
Jayden says that the dentist can shine a special light on his teeth that will make his teeth become whiter. Can light change Jayden’s teeth? Yes. Teeth can take in energy from the light, causing them to become whiter.
Wei saw a special type of plastic that would melt and become a liquid when it was placed in the sun, but it would not melt when placed under a desk lamp. Why does light from the sun melt the plastic when light from the desk lamp does not? Because the plastic can take in energy from the light from the sun but not from the light from the lamp.
Using special paper that can permanently change color with light, infrared light reflects off the paper; X-ray light transmits through the paper; ultraviolet light is absorbed by the paper. Which type of light can cause the paper to change color? The ultraviolet light can cause the paper to change color.
Your friend says that he heard about some rocks that would glow when they were put under a certain kind of light. Can light cause rocks to glow? Yes. Rocks can take in energy from the light, causing them to glow.
Ultraviolet light will cause the paint on museum paintings to fade, but the overhead lamps in a museum won’t cause the paint to fade. Why does the ultraviolet light cause the paint to fade when light from the overhead lamps does not? Because the paint can take in energy from ultraviolet light but not from the light from the overhead lamps.
Sometimes marbles get warm after being exposed to different types of light. X-ray light is transmitted through the marbles; Infrared light is absorbed by the marbles; Red light is reflected off the marbles. Which light causes the marbles to get warm? The infrared light can cause the marbles to get warm.
NASA has a new type of metal. Khaled is curious about whether light can cause changes to this new metal when different types of light hit the metal. Gamma ray light is absorbed and Ultraviolet light is absorbed. Can light cause changes to the metal? Yes, and the metal can change in one or two different ways, such as by getting warm and/or changing color, because different types of light can cause different changes to a material when they are absorbed.
Metal used to make satellites when hit with infrared light is absorbed, X-ray light is transmitted through, and visible light is reflected off. Can light cause the metal to get warm? Why or why not? Does it matter what type of light shines on the metal? Yes, light can cause the metal to get warm because light carries energy that can cause materials to change but only when absorbed. Yes, the type of light matters because materials can only take in energy from some types of light and not others.
When exposed to light a butterfly absorbs ultraviolet light, reflects green light, and red light is transmitted through the butterfly’s wings. Can light cause the butterfly’s wings to glow? Why or why not? Does it matter what type of light? Yes, light can cause the butterfly’s wings to glow because light carries energy that can cause materials to change but only when absorbed. Yes, the type of light matters because materials can only take in energy from some types of light and not others.
All light is visible to our eyes. True or False False
A gamma ray is a type of light. True or False True
Sunscreen is important protection from UV light rays. True or False True
Green plants reflect green light. True or False True
A red apple absorbs red light. True or False False
If an object reflects light, it will get warm. True or False False
If an object transmits light, it will get warm. True or False False
If an object absorbs light, it will get warm. True or False True
Melanin helps protect our DNA from UV light. True or False True
There is more melanin in light skin than dark skin. True or False False
Australia has the highest rates of skin cancer in the world. True or False True
Your cat likes to sit in the window because the light is transmitted through the window and onto your cat. True or False True
Created by: kbieber2023
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