Chapter 1 Light Waves Amplify Review

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?

• No. Light is not a physical thing, so it cannot change physical things like rugs.

• No. Light can only change things by warming them up, so it cannot cause the rug’s color to fade.

• Yes. The rug can take in energy from the light, causing the rug’s color to fade.

• Yes. Light from the sun can pull energy out of the rug, causing the rug's color to fade.

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These graphs show the wavelength and amplitude of light coming from three lasers. Could any of these lasers be giving off a different type of light?

• Yes. Laser 2 could be giving off a different type of light because Laser 2 has a different wavelength than Lasers 1 and 3.

• Yes. Laser 3 could be giving off a different type of light because Laser 3 has a different amplitude than Lasers 1 and 2.

• Yes. All three lasers must be giving off different types of light because every light source gives off its own type of light.

• No. All three lasers must be giving off the same type of light because all three are lasers, and the same kind of light source gives off the same type of light.

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Light ...

• can only be reflected

• only comes in one form

• carries energy from one place to another, even through empty space

• is a type of wave that carries energy from one place to another, even through empty space

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In order to see an object, light must be

• transmitted into your skin

• reflected off the object and into your eyes

• reflected off the object then off the ground then into your eyes

• absorbed by your genetic material

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Aniyah has a special type of paper that can permanently change color. She wonders whether light can cause the paper’s color to change. The table below shows what happens when different types of light hit the paper. Based on this information, which type of light can cause the paper to change color?

• The infrared light can cause the paper to change color.

• The X-ray light can cause the paper to change color.

• The ultraviolet light can cause the paper to change color.

• Any of these types of light can cause the paper to change color, because all light carries energy that can cause materials to change.

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If an object appears green it must ...

• reflect green light

• transmit blue light

• absorb green light

• reflect yellow and orange light

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Ana wonders how light can affect a mystery material. The table below shows what happens when different types of light hit the mystery material. Based on this information, can light change the mystery material?

• Yes, but the mystery material can change in only one way, such as by getting warm, because all the light that a material absorbs will affect that material in the same way.

• 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.

• No. The mystery material can’t change because light is not a physical thing. Light cannot change physical things like the mystery material.

• There is no way to know whether the mystery material will change or not.

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When a material absorbs energy from light the energy causes the material...

• to stay the same

• to transmit the light

• to reflect the light

• to change

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Different types of light can change a material ...

• in different ways

• in the same way

• only if it transmits the light

• only if it reflects the light

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When a material allows light to pass through it,

• the material reflects the light and changes

• the material absorbs the light and doesn't change

• the material transmits the light and doesn't change

• material transmits the light and changes

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