science sound

• What causes sounds to be made?

• Silence
  

• Vibrations
  

• Air movement
  

• Light

What happens when you hold your hand on your throat and hum a tune?

• You see vibrations
  

• You feel the vibrations
  

• You hear nothing
  

• You stop vibrations

What do you do to make guitar strings vibrate?

• a) Hit them
  

• b) Press them
  

• c) Pluck them
  

• d) Blow on them

Sounds are made when things

Order these sentences to show how do you hear the sound when you hit the jar.

• The jar vibrates when you hit it.

• The vibrations travel through the air in the jar to the plastic wrap.

• The plastic wrap vibrates. The rice grains vibrate and you see the rice grains move. you hear the sound.

The ​ (a)   travel from the tin tray to the air.

The air ​ (b)   and makes the plastic wrap vibrate.

The vibrations ​ (c)   from the plastic wrap to the ​ (d)   .

We see the rice grains jump.

• vibrations
• vibrates
• travel
• rice grains

What causes the jar to produce sound?

• a) The jar moves in circles
  

• b) The jar vibrates
  

• c) The jar heats up
  

• d) The jar is broken

How do the vibrations travel to the ears?

• a) Through water
  

• b) Through the ground
  

• c) Through the air
  

• d) Through metal

Where do the vibrations travel from the tin tray?

• a) To the ground
  

• b) To the rice grains
  

• c) To the air
  

• d) To the plastic wrap

What do we observe when the rice grains are affected by the vibrations?

• a) The rice grains jump
  

• b) The rice grains dissolve
  

• c) The rice grains stay still
  

• d) The rice grains float