Share 7th Grade Science Unit 6
Save to Folder
If you hit a drum with more force, what happens to the sound?
It becomes louder
What do vocal cords do when you speak?
They vibrate
What is the speed of sound waves in air?
About 343 meters per second
How do sound waves travel?
Through vibration of particles
Can sound travel through a vacuum?
No
What three states of matter can sound travel through?
Solids, liquids, and gases
What is the term for the substance that sound moves through?
Medium
Why can't sound travel in space?
Space is a vacuum with no particles for sound to travel through
What is an echo?
A sound wave that bounces off a surface and returns to the original source
What method do bats use to locate insects?
Echolocation
What do boats use echoes for?
To measure water depth
Why is the total distance sound travels in water depth measurement double the actual depth?
The sound travels down and back up
What medical technology uses sound echoes to see inside the body?
Ultrasound scans
Why do recording studios need to prevent echoes?
Echoes can distort the sound
What are the four main layers of the Earth?
Crust, Mantle, Outer Core, Inner Core
What is the mantle made of?
Molten rock that can flow slowly
