Sound travels ____ times faster through a metal pipe than it does air.

A slinky is a perfect way to show how sound ____________.

An echo is a sound that has been bounced back, or ____________.

Your ear is a _______________ for incoming sound waves.

Sound waves make your ear drum ______________.

The vibrations in your eardrums makes the __________ and fluid in your ear vibrate.

Sound wave signals get sent to your ________ to get interpreted.

Increased frequency (more waves per second) results in a ___________ pitch.

Decreased frequency (fewer waves per second) results in a ___________ pitch.

Why do sound waves need air?

Humans can hear ____ - __________ frequency.

Sounds below 20 frequency are called ____________.

Infrasonic waves can be heard by _____________.

Sound waves above 20,000 frequency are called __________.

Ultrasonic waves can be heard by ______ and _________.

Ultrasound is too ______ for us to hear.

Ultrasound microphones are used to send a sound wave so that they can see where a baby is by having the sound __________.

When you strike a key on the piano, one of the _________ begins to vibrate.

The vibration is what makes __________.

Things vibrate at their _____________ frequency.

________ are specialized structures to catch sound.

When you speak, your ________________ vibrate.