7th Grade Unit #2 Test Light and Electromagnetic Spectrum

How is ultraviolet light different from the light emitted by a flashlight?

• Ultraviolet light is brighter than the light from a flashlight.

• Only light from a flashlight can travel through space.

• Ultraviolet light has a longer wavelength than the light from a flashlight.

• Ultraviolet light is invisible to the human eye.

The illustration shows what happens when white light is passed through a prism.

How is white light different from the rest of the electromagnetic spectrum?

• White light has a spectrum of colors.

• White light has the same wavelength.

• White light is invisible.

• White light can travel through both empty space and matter.

The sun's energy reaches Earth in waves of varying wavelengths. Which is the correct order from the shortest wavelength to the longest wavelength?

• ultraviolet - infrared - visible light

• infrared - ultraviolet - visible light

• ultraviolet - visible light - infrared

• infrared - visible light - ultraviolet

Light can sometimes create an optical illusion. For example, you may see something underwater and reach into the water to pick it up. However, the object is not where you thought it would be. What property of light is responsible for this optical illusion?

• absorption

• reflection

• refraction

• transmission

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To save energy, some people install solar panels on their homes as shown in the illustration below. What interaction between solar panels and sunlight enables people to save on energy?

• The energy of the sunlight is reflected by the solar panels.

• The energy of the sunlight is refracted by the solar panels.

• The energy of the sunlight is absorbed by the solar panels.

• The energy of the sunlight is transmitted through the house.

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The drawing illustrates a wave in motion. What is the name given to the substance through which a wave travels?

• a crest

• a frequency

• a medium

• a state

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The sun’s energy arrives as radiation on Earth. When Hector was at the beach, he needed to wear his sunglasses. Which part of the electromagnetic spectrum made Hector put on his sunglasses?

• visible light

• infrared radiation

• ultraviolet radiation

• microwave radiation

White light is made up of a spectrum of many different colors. What property is used to divide the various colors in the spectrum?

• density

• wavelength

• speed

• temperature

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The sun’s energy arrives as radiation on Earth. When Hector was at the beach, he especially enjoyed the warmth of the sun. Which part of the electromagnetic spectrum caused Hector to feel warm?

• visible light

• infrared radiation

• ultraviolet radiation

• microwave radiation

The illustration below shows a portion of the electromagnetic spectrum. Which of the following labels should be placed in the shaded box in the illustration?

• TV waves

• visible light

• cosmic rays

• sound

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