Discover Education 3.2 Sound Waves

1. In order for an object to make sound, it must...

• not move

• vibrate

• be in a vacuum

• be living

Through which material do sound waves travel the slowest

• steel

• water

• plastic

• air

Tags

NGSS.MS-PS4-2

Sound waves move

• outward in one direction

• outward in all directions

• upward

• downward

When you watch fireworks, you always hear the bang after you see the flash. Because: .....

• when something explodes, the sound always happens after the flash

• sound travels faster through air than light

• sound travels slower through air than light

• your ears take longer to send messages to your brain than your eyes do

Suppose an astronaut is looking out the window of her spacecraft in outer space when two small comets collide and explode right in front of her. She would...

• see and hear the explosion

• See the explosion but not hear it

• hear the explosion but not see it

• not see or hear the explosion

Tags

NGSS.MS-PS4-1

Through which material do sound waves travel the fastest?

• steel

• water

• space

• air

Tags

NGSS.MS-PS4-2

Suppose you are listening to a radio that is playing music. As you walk away from the radio, the music becomes less loud. This is because sound waves _____ as they travel.

• gain energy

• collect together

• spread out

• slow down

Tags

NGSS.MS-PS4-2

As sound waves travel farther from the object that made the sound they.....

• become louder

• grow larger

• change direction

• become smaller

Tags

NGSS.MS-PS4-1