Sound Energy

What is frequency?

• the number of vibrations per second
• how high or low a sound is
• the loudness or softness of a sound
• the back and forth movement of matter

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Measure of how high or low a sound is

• amplitude
• compression
• speed of sound
• pitch

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A longer string makes a _______ pitch than a short string.

• louder
• softer
• higher
• lower

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NGSS.4-PS4-1

An object that does not vibrate cannot produce

• sound
• light
• heat
• electricity

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Sound is a form of? 

• energy
• pitch
• volume

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What type of materials REFLECT sound?

• hard materials
• smooth materials
• both hard and smooth materials
• porous materials

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NGSS.MS-PS4-2

How can you create a low pitch sound on a violin? 

• Pluck the thinnest string
• Pluck all the strings once together
• Pluck the thickest string
• Play the guitar

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NGSS.4-PS4-1

Destiny hits a symbol with her drumstick and makes it vibrate.  She then puts her hand on the symbol and stops the vibration.  What happened to the sound of the symbol? 

• The sound continues but not as loud. 
• The sound continues but has a lower pitch. 
• The sound stops because her hand absorbs the sound. 
• The sound stops because the vibrations have stopped. 

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Yeli was at Busch Gardens.  She heard an a girl scream on one of the rides.  What did the pitch of her voice sound like and why? 

• The pitch was high because her vocal chords vibrated quickly
• The pitch was low because her vocal chords vibrated slowly. 
• The pitch was high because her vocal chords vibrated slowly. 
• The pitch was low because her vocal chords vibrated slowly. 

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NGSS.4-PS4-1

Vibrating vocal chords causes sound energy when a person speaks.

• True
• False

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