What is a vibration? A vibration is the ________ movement of an object.

As sound travels through a material, what do the molecules in the material do? The molecules in the material ________ in a regular pattern.

What happens when molecules bump into each other? The molecules bump into each other, ________ the pattern on to other molecules.

Sound is used by many organisms to ________.

What happens to our vocal cords when we talk and sing? Our vocal cords ________ when we talk and sing.

What happens to the air around our vocal cords when we talk and sing? The air around them ________ and travel outward in sound waves.

Through which materials can sound travel?

Can sound travel through a vacuum?

What is necessary for sound to exist? Without ________ particles, sound cannot exist.

Echo - when a sound wave reaches a ______ between materials and bounces back.

Sound can be ______ or pass through a second material.

Sound travels through different materials at different speeds. What is the speed of sound in air at 0 degrees Celsius/32 degrees F?

Areas where particles are very close together is called ______.

The number of compressions that pass by each point each second is a wave's ______.

Frequency is a measure of how often particles are ______.

The greater the frequency, the ______ the pitch of the sound.

The sound waves of louder sounds have more energy when it reaches your ear due to closeness or the sound is vibrating more.

When the ______ gets to your ear, your eardrum will vibrate more than with a soft sound.

For a sound to be heard, energy must first cause an object to ______.

Vibrating objects transmit energy as ______.

The energy is transmitted through the air as ______ move.

When the energy reaches your ear, the eardrum absorbs the energy and begins to ______.

Vibrations are interpreted as ______ in your brain.