Sound

Sound travels FASTEST through which of these materials?

• Air
• Empty space
• Metal
• Water

Sound is caused by? 

• force
• vibrations
• instruments

What is vibration?

• how loud a sound is
• the back and forth movement of matter
• how high or low a sound is
• the loudness or softness of a sound

To make a sound from a stringed instrument louder you must

• hit it
• pluck it harder
• hold it higher
• pluck it softer

Why is sound able to travel faster through a solid than a gas?

• Gas molecules are packed tightly.
• Sound does not travel faster through a solid than a gas.
• Solid molecules are packed tightly.
• Gas molecules move slowly.

Low pitch sounds are caused by a ______ vibration

• fast 
• slow
• hard
• soft

The reflection of sound waves off of a hard surface can create ______.

• A wave
• An echo 

_______ is the number of waves that pass a certain point at an specific time. 

• Frequency 
• Pitch
• Amplitude
• I don't know

If you shorten the length of guitar string it makes a ________ pitched sound

• higher
• lower

If a thick rubber band and a thin rubber band are plucked, the thicker one produces a _______ pitched sound

• higher
• lower