S8P4D Light and Sound Waves

What is the difference between a reflected and a diffracted sound wave?

• A diffracted sound wave bounces back to the place of origin. A reflected sound wave changes direction as it passes through an opening.

• A reflected sound wave bounces back to the place of origin. A diffracted sound wave changes direction as it passes through an opening.

• A diffracted sound wave bounces back to the place of origin. A reflected sound wave is absorbed as it passes through an opening.

• A reflected sound wave is absorbed by the medium. A diffracted sound wave changes direction as it passes through an opening.

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NGSS.MS-PS4-2

Which of the following waves require a medium to travel through?

• gamma waves

• microwaves

• sound waves

• infrared waves

A student views a table of the speed of sound waves in three different materials. Which conclusion can be drawn based on the information in the table?

• Sound travels slower in air because it has a higher density than the other materials.

• Sound travels slower in water because it has a lower density than the other materials.

• Sound travels faster in glass because it has a higher density than the other materials.

• Sound travels faster in glass because it has a lower density than the other materials.

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NGSS.MS-PS4-2

What causes light to slow down?

• moving into a vacuum

• moving into a lighter medium

• moving into a less adhesive medium

• moving into a denser medium

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NGSS.MS-PS4-2

What happens when light is refracted?

• It changes direction.

• It becomes invisible.

• It releases heat.

• It moves faster.

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NGSS.MS-PS4-2

The table shows the speed of sound in fresh water and salt water. Which statement best describes why sound waves travel faster in salt water than in fresh water?

• Salt water exists in a different phase than fresh water.

• Fresh water has greater elasticity than salt water.

• Fresh water is less dense than salt water.

• Salt water is hotter than fresh water.

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NGSS.MS-PS4-2

Which best describes how electromagnetic waves travel?

• Electromagnetic waves are reflected by all physical media when traveling on Earth.

• Electromagnetic waves are reduced in energy by traveling through a vacuum.

• Electromagnetic waves can travel through a vacuum or a physical medium.

• Electromagnetic waves can only travel through a vacuum in space.

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NGSS.MS-PS4-2

The table gives the densities of air and water. Using the data in the table, describe how a light wave changes as it travels from the air into water.

• It slows down because water is more dense than air.

• It speeds up because water is more dense than air.

• It speeds up because water is less dense than air.

• It slows down because water is less dense than air.

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NGSS.MS-PS4-2

The table shows the speed of light in three states of matter. What happens to the speed of light as it travels from the air to water?

• The speed increases.

• The speed decreases.

• The speed increases and then decreases.

• The speed decreases and then increases.

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NGSS.MS-PS4-2

A student views a table of the speed of sound in three different materials. Which conclusion can be drawn based on the information in the table?

• Sound travels faster in glass because it has a lower density than the other materials.

• Sound travels faster in glass because it has a higher density than the other materials.

• Sounds travels slower in water because it has a lower density than the other materials.

• Sounds travels slower in air because it has a higher density than the other materials.

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NGSS.MS-PS4-1