Light Waves Mod L Unit 1 Lesson 3 Review

What are the two parts of electromagnetic waves?

• changing electric and magnetic fields.

• waves of sound

• electric fields only

• magnetic fields only.

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The electromagnetic spectrum is made of

• visible light

• ultraviolet light

• sound waves

• x-rays, radio waves, and microwaves

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A _________ frequency mean more energy.

• lower

• higher

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More energy means _______ danger to human cells.

• more

• less

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Radio waves are safe for human.

• True

• False

Ultraviolet light has a __________ frequency and it is ________ dangerous to human cells.

• higher, not at all

• lower, possibly

• higher, not at all

• higher, possibly

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Based on your observations of a prism, which of these statements are true?

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

• Humans see the different wavelengths of visible light as different colors.

• 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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If visible light includes a range of colors, what determines our perception of the color of an object?

• the colors the object reflects and absorbs

• the size and shape of the object

• the light that is available in the area

• the texture of the object

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Which of the following are reasons that light appears dimmer at increasing distances from a light source?

• Light waves slow down as they travel through a medium.

• The energy of a light wave is absorbed by the medium as the light travels through a medium.

• Light waves spread over more area as a wave travels away from the light source.

• The wavelength of a light wave increases as the wave travels away from the light source.

Answer explanation

The brightness of light is related to the energy of the light wave. As light waves travel away from a source, they spread out, which decreases the energy and makes the light dimmer. If the light is traveling through a medium, the medium absorbs some of the energy, which also makes the light dimmer.

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Speed of Light

Study the diagram. Which statements are true? Choose all that apply.

• Light travels at the same speed in water, glass, and diamond.

• Light travels the fastest in a vacuum compared to the other mediums.

• Light can’t travel through any mediums at all.

• Light travels slower in mediums than it does in a vacuum.

• Light can travel with or without a medium.

Answer explanation

Light can travel with or without a medium, but travels the fastest in a vacuum.

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