Understanding Sound Waves and Loudness | Grade 5

How far did the sound from the Krakatoa volcano explosion (a very large volcanic eruption) travel across Earth?

• 5,000 kilometers

• 1,000 kilometers

• 10,000 kilometers

• 2,500 kilometers

How do sound waves move through matter (like air, water, or solids)?

• By changing color

• By compressing and expanding molecules

• By moving in a straight line

• By creating a vacuum

What makes a sound wave carry more or less energy?

• The speed of the wind

• The difference in pressure areas

• The temperature of the air

• The color of the medium

How do our ears change sound waves into signals our brain can understand?

• They store sound energy

• They reflect sound waves

• They convert vibrations into nerve signals

• They amplify sound waves

How does the shape of our ear help us hear some sounds better than others?

• Due to the density of air

• Due to the structure of our vocal cords

• Because of the frequencies of human voices

• Because of the shape of our ears