BJU 5th grade science Chapter 9

Question 1

The part of a sound wave where the motion of each vibration pushes together particles of matter

Accepted Answer

compression

Question 2

The science of sound

Accepted Answer

acoustics

Question 3

A type of echolocation that locates items underwater

Accepted Answer

sonar

Question 4

Sound moves the slowest through ____________.

Accepted Answer

gases

Question 5

Sound waves that travel through matter are described as ______________ waves.

Accepted Answer

mechanical

Question 6

The number of waves that pass a point in one second is the __________ of a sound wave.

Accepted Answer

frequency

Question 7

Musical instruments that play at the same pitch and volume sound different because of ___.

Accepted Answer

timbre

Question 8

The quality of a sound that distinguishes it from another sound

Accepted Answer

timbre

Question 9

A sound wave that bounces back towards its source and is heard again

Accepted Answer

an echo

Question 10

Smooth, hard surfaces usually __________ sound.

Accepted Answer

reflect

Question 11

Most of the sounds that we hear are a blend of __________________ waves.

Accepted Answer

several

Question 12

Does a sound wave carry particles of matter with it?

Accepted Answer

no

Question 13

A harsh, unwanted, or surprising sound is often called _____________.

Accepted Answer

noise

Question 14

Most sounds we hear travel through ________.

Accepted Answer

air

Question 15

A vibration that can be heard

Accepted Answer

sound

Question 16

Both singing and speaking are caused by vibrations of the vocal cords inside the ________.

Accepted Answer

voice box, larynx

Question 17

What is how high or low a sound is?

Accepted Answer

pitch

Question 18

Objects that vibrate quickly have a __________ pitch.

Accepted Answer

high

Question 19

The loudness or softness of a sound

Accepted Answer

volume

Question 20

Most sound waves gradually get __________ as their energy is used up.

Accepted Answer

softer

Question 21

A machine that changes sound waves into electrical pictures seen on a graph.

Accepted Answer

oscilloscope

Question 22

The intensity of a sound is measured in________.

Accepted Answer

decibels

Question 23

A disturbance that moves energy from place to place

Accepted Answer

wave

Question 24

Sound moves through matter in _________.

Accepted Answer

waves

Question 25

Rough, fuzzy surfaces usually __________ sound.

Accepted Answer

absorb

Question 26

Sound waves travel in _________ directions away from the source of the sound.

Accepted Answer

all

Question 27

The pitch of a sound is related to its______.

Accepted Answer

frequency

Question 28

The echoes of high-frequency sound waves to "see" inside a human body

Accepted Answer

ultrasound

BJU 5th grade science Chapter 9

Questions 28

BJU 5th grade science Chapter 9

Questions 28