Light Waves 8th grade

If a car sits out in the sun every day for a long time, can light from the sun damage the car’s paint?

• Yes. The paint can take in energy from the light, causing it to be damaged.

• No. Light can only change things by warming them up, so it cannot damage the car’s paint.

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

• Yes. Light from the sun can pull energy out of the paint, causing it to be damaged.

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Alex has a type of rock called calcite, that sometimes glows. He puts the calcite under a desk lamp but the calcite does not glow. Then he puts it under an ultraviolet lamp and the calcite glows. Why does ultraviolet light make the calcite glow when light from the desk lamp does not?

• Because ultraviolet light carries energy, and light from the desk lamp does not.

• Because ultraviolet light pulls energy out of the calcite, and light from the desk lamp does not.

• Because calcite can take in energy from ultraviolet light but not from the light from the desk lamp.

• Because ultraviolet light carries glowing molecules, and light from the desk lamp does not.

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Shonda is learning about a new kind of material that might be used to make new satellites, and she wonders if light can damage the material. Results show that X-ray light reflects off the material while gamma ray light transmits through the material. Based on this information, which type of light is more likely to damage the material?

• The gamma ray light is more likely to damage the material because the gamma ray light can pull energy out of the material when it passes through the material.

• The X-ray light is more likely to damage the material because the X-ray light bounces off of the material, which means that it has more energy.

• There is no way to know because they are two different types of light, and different types of light can change a material in different ways.

• Neither type of light is likely to damage the material because the material does not take in energy from either the X-ray light or the gamma ray light.

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Kayla wonders if lasers will be able to cut a hole in a piece of silicone. Results show that helium-neon laser light reflects off the silicone, carbon dioxide laser light is absorbed by the silicone, and diode laser light is transmitted through the silicone. Based on this information, which type of laser light can cut a hole in the silicone?

• The helium-neon laser can cut a hole in the silicone.

• The carbon dioxide laser can cut a hole in the silicone.

• The diode laser can cut a hole in the silicone.

• Any of these types of light can cut a hole in the silicone, because all light carries energy that can cause materials to change.

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When light bounces off something it is known as _____________

• reflection

• refraction

• light energy

• mechanical energy

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What color of the rainbow has the longest wavelength?

• red

• blue

• green

• violet

The highest point of a wave is known as the ___________

• wavelength

• trough

• amplitude

• crest

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What type of wave is a light wave?

• A sound wave

• A seismic wave

• An electromagnetic wave

• A mechanical wave

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What is the amplitude of this model wave?

• 0mm

• 5cm

• 15cm

• 10mm

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Based on your observations of the prism, select the true statements.

• When light travels through a prism, the light is separated by wavelength.

• The prism is being used to combine different colors of light.

• The light bends when it enters the prism and again when it leaves the prism.

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