4th grade sound

What will sound waves NOT travel through?

• water

• air

• empty space

• a brick wall

What causes a sound wave to form?

• Matter vibrates.

• Matter stretches.

• Matter is heated.

• Matter grows.

Choose the one that sound will travel the fastest.

• a cloud

• water in a lake

• Earth's atmosphere

• a metal railroad track

The part of the ear that is a thin flap of skin that vibrates whn sound waves strike it is the

• inner ear.

• outer ear.

• middle ear.

• eardrum.

Sound is a form of _____________ produced by vibrations of matther.

• air

• energy

• signals

• frequencies

A _____________ is a tool used to make a picture of a sound wave.

• telescope

• microscope

• oscilloscope

• microwave

What causes the keys on a piano to be different pitches?

• where the key is on the piano

• the keys are made with the same length of strings

• how hard you strike the keys

• short and long strings

Scientiest measure the loudness of sound in units called

• decibels.

• milliliters

• square inches

• degrees

The ____________ of a wave measures how many waves pass in a given amount of time.

• pitch

• medium

• crest

• frequency

Objects ____________ when they move back and forth quickly.

• break

• wave

• vibrate

• amplitude