7th grade 1.4: Waves

Which of the following correctly identifies the speed of sound waves in a substance?

• slowest through air

• slowest through ice

• fastest through water

• the same through all materials

Tags

NGSS.MS-PS4-2

Which of the following options correctly organizes the speed of sound waves, from fastest to slowest, in different states of matter?

• liquid, solid, gas

• solid, liquid, gas

• gas, liquid, solid

• solid, gas, liquid

Tags

NGSS.MS-PS4-2

In which of the following does light travel the slowest?

• gas

• solid

• liquid

• vacuum

Tags

NGSS.MS-PS4-2

Examine the following image. Which statement best describes the phenomenon that is occurring?

• Light speeds up as it moves from the air into the water causing it to refract.

• Light travels in a straight line from the air into the water causing it to reflect.

• Light travels in a straight line from the water into the air causing it to reflect.

• Light slows down as it moves from the air into the water causing it to refract.

Tags

NGSS.MS-PS4-2

Examine the following image. Which statement describes how visible light interacts with the leaf?

• Red light is absorbed while all other colors are refracted.

• Red light is reflected while all other colors are absorbed.

• Red light is refracted while all other colors are absorbed.

• Red light is absorbed while all other colors are reflected.

Tags

NGSS.MS-PS4-2

Aisha was watching a fireworks display at her local theme park. What statement below explains what she saw?

• She heard and saw the fireworks at the same time.

• She saw the fireworks first because of where she was standing.

• She saw the fireworks first because light travels faster than sound.

• She heard the fireworks first because sound travels faster than light.

How can the behavior of light be described as it leaves outer space (a vacuum) and travels into Earth's atmosphere?

• Light waves slow down as they enter the Earth's atmosphere from space.

• Light waves continue at the same speed as they enter the Earth's atmosphere from space.

• Light waves speed up and then slow down as they enter the Earth's atmosphere from space.

• Light waves slow down and then speed back up as they enter the Earth's atmosphere from space.

Answer explanation

Light Travels fastest in the vacuum of space (no matter)

Tags

NGSS.MS-PS4-2

The amount of light that can pass through an object depends on the material it is made of. Which option correctly classifies the object based on how much light passes through?

• A

• B

• C

• D

Tags

NGSS.MS-PS4-2