Sound Revision Grade 4

What is sound?

• Sound is a form of solid matter

• Sound is a type of light wave

• Sound is a form of energy produced by vibrations traveling through a medium.

• Sound is a type of magnetic force

What is vibration?

• A stationary position of an object

• A rapid back and forth movement of an object

• A side to side movement of an object

• A slow and steady movement of an object

Construction workers use ___ _________ to muffle the loud sounds around them so their ears do not get damaged.

How do these instruments make sound?

• Plucking

• 
• Blowing

• 
• Hitting or Striking

• 

Where is the ear drum?

High pitch or low pitch?

Groups:

(a) High Pitch

,

(b) Low Pitch

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• 
• 
• 
• 
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• 
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When I tighten the string of a guitar, the pitch is​ (a)   because the vibrations are ​ (b)  

• higher
• faster
• lower
• slower

When I loosen the string of a guitar, the pitch is​ (a)   because the vibrations are ​ (b)  

• higher
• faster
• lower
• slower

This sound from this bottle is high pitched because the air particles have ____ space to vibrate.

The sound from this bottle is low pitched because there is more space for the air particles and the vibrations are ______.