Sound travels FASTEST through which of these materials?

• Air
• Empty space
• Metal
• Water

Sound is caused by? 

• force
• vibrations
• instruments

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

Without matter, sound waves could not travel.

• True
• False

how high or low a sound seems

• pitch
• wavelength
• amplitude
• scream

Which travels faster, light or sound?

• Light
• Sound

_____________________________ is an area of particles that moves outward in all directions from a vibrating object.

• frequency
• sound wave
• pitch
• intensity

Sound will travel slowest through which of the following forms of matter?

• milk
• desk
• air
• door

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.

• Yes
• No