Sound Ch. E3 Science

Vocabulary

100

series of vibrations that can be heard

sound

200

measure of sound energy reaching your ear

loudness

300

area where air is pushed together by vibrations

compression

400

sound wave made by an object moving faster than the speed of sound

sonic boom

500

moving areas of high and low pressure

sound waves

Vocabulary/MC

100

reflection of sound waves

echo

200

rate of travel of a sound wave

speed of sound

300

measure of how high or low a sound is

pitch

400

Which of the following best shows how sound waves travel?

--a marble dropped in a bowl of water

--a baseball hit by a bat

--a car speeding up and down hills

--a branch moving back and forth

a marble dropped in a bowl of water

500

The loudness of a sound depends on--

--the speed of the vibrations

--the pitch of the sound

--the amount of energy used

--how far the vibrating object moves

how far the vibrating object moves

Multiple Choice

100

Your brain interprets signals from ______ as sounds.

--inner ears

--tiny hairs that affect nerve cells

--three bones in the middle ear

--eardrums

tiny hairs that affect nerve cells

200

The pitch of a stringed instrument can be affected by--

--how hard it is struck or plucked

--the length of the strings

--the size of the player's fingers

--an object called a hammer

the length of the strings

300

If a sound's pitch is high, its source is--

--a sonic boom

--nearby

--vibrating quickly

--an echo

vibrating quickly

400

An echo will sound most like the original sound if you shout--

--into your hand

--under water in a pool

--toward a hillside

--in a long hallway

in a long hallway

500

A sonic boom is caused by--

--an object flying over a desert

--an object moving in outer space

--an object moving faster than the speed of sound

--an object moving from a ship to the ocean's floor and back

an object moving faster than the speed of sound

MC/Short Answer

100

Sound waves cannot travel through--

--liquids

--gases

--empty space

--solids

empty space

200

A sound wave has areas called _____ where particles are squeezed together.

--pitches

--sonic booms

--compressions

--echoes

compressions

300

A ___________ reflects sound best.

--very hot gas

--soft, white wall

--rough, uneven surface

--hard, smooth surface

hard, smooth surface

400

Why does cupping your hands around your mouth when you shout make the sound travel farther?

Cupping the hands directs the sound waves.

500

Why do you think you often can see a plane in the air before you hear it?

The speed of light (which enables you to see the plane) is faster than the speed of sound.