Bill Nye: Sound

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

18

Humans can hear __-_____ frequency.

20-20,000

Ultrasonic waves can be heard by ____ and ______

bats and whales

The vibration in your eardrums makes the _____ and _____ in your ear vibrate.

bones, fluid

An echo is a sound wave that has been _______ ____or_________.

bounced back, reflected

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

brain

Each ear has a ___ designed to _____ sound.

cup, focus

____ are specialized structures to catch sound

ears

Infrasonic waves can be heard by ________

goldfish

Increased frequency of a wave (more waves per second) results in a ______ pitch.

higher

Sounds below 20 are called __________

infrasonic

Why does a sound wave need air?

it is the medium it travels through

Decreased frequency of a wave (less waves per second) results in a _____ pitch.

lower

Sound is _________ or __________ of air.

movements, vibrations

Things vibrate at their _______ frequency

natural

An _____________ lets us see sound waves.

oscilloscope

Submarines translate sound waves into ________.

pictures

Your ear is a ___________for incoming sound waves.

reciever

(Ultrasound) Microphones are used to send a sound wave so that they can see where baby is by having the sound _________

reflected

The vibration is what makes _____

sound

Ultrasound is ___ ____ for us to hear

too high

A slinky is perfect for showing how a sound wave _______.

travels

Sounds above 20,000 are called ____________

ultrasonic

Sound waves make your ear drum_______.

vibrate

When you speak, your vocal chords ______

vibrate

When you strike a key on the piano, one of the strings begins to _______

vibrate