Chapter 20

Question 1

Vibration

Answer 1

Complete back and forth motion of an object

Question 2

Longitudinal Waves

Answer 2

Waves made of compressions and rarefactions

Question 3

Sound Waves

Answer 3

Longitudinal wave caused by vibrations and carried through a material medium

Question 4

Medium

Answer 4

Physical Environment

Question 5

Outer Ear (How Human Ear works)

Answer 5

Funnel for sound waves

Question 6

Middle Ear (How Human Ear works)

Answer 6

Three Bones: Hammer,Anvil, and Stirrup. Act as levers to increase the size of the vibration

Question 7

Inner Ear (How Human Ear works)

Answer 7

Vibration created by sound are changed into electrical signals for the brain to interpret

Question 8

Tinnitus

Answer 8

Common type of hearing loss. Result from long term exposure to loud sounds

Question 9

Protect your hearing

Answer 9

Listen to lower volume when using your headphone

Question 10

True or False: Sound Waves travel in all directions away from their source

Answer 10

True

Question 11

True or False: Sound can travel in a vacuum

Answer 11

False. Sound waves require a medium through which to travel.

Question 12

True or False: Your ears convert sound to electrical impulses that are sent to your brain

Answer 12

True

Question 13

Sound travels as __________

Answer 13

Longitudinal Waves

Question 14

Which part of the ear increases the size of the vibrations of sound waves entering the ear?

Answer 14

Middle Ear

Question 15

Name two ways of protecting your hearing?

Answer 15

1. Lower volume when using headphones. 2. Move away from loud sounds.

Question 16

True or False: All sounds are generated by vibrations

Answer 16

True

Question 17

True or False: Exposure to loud sounds can cause hearing damage

Answer 17

True

Question 18

True or False: Using earplugs and lowering the volume of sounds can prevent hearing damage.

Answer 18

True

Question 19

Pitch

Answer 19

Measure of how high or low a sound is perceived to be, depending on the frequency of the sound wave

Question 20

Doppler Effect

Answer 20

An observed change in the frequency of a wave when the source or observer is moving

Question 21

Loudness

Answer 21

The extent to which a sound can be heard

Question 22

Decibel

Answer 22

The most common unit used to measure loudness (Symbol, dB)

Question 23

True or False: The speed of sound depends on the medium and the temperature

Answer 23

True

Question 24

True or False: The Pitch of a sound becomes higher as the frequency of the sound becomes higher

Answer 24

True

Question 25

Frequency

Answer 25

Expressed in units of Hertz(Hz), which is equivalent to waves per second

Question 26

True or False: Doppler Effect is the apparent change in frequency of a sound caused by the motion of either the listener or the source of the sound.

Answer 26

True

Question 27

Loudness _________ with the amplitude of the sound.

Answer 27

Increases. Loudness increases with the amplitude of the sound

Question 28

Loudness is expressed in __________

Answer 28

Decibels. Loudness is expressed in Decibels.

Question 29

The amplitude and frequency of a sound can be measured electronically by an ___________

Answer 29

Oscilloscope. The amplitude and frequency can be measured electronically by an oscilloscope.

Question 30

At the same temperature, in which medium does sound travel fastest? A) Air B) Liquid C) Solid D) It travels at the same speed through all media

Answer 30

D) Solid. Sound travels faster in solids

Question 31

How does the temperature of the medium affect the speed of sound through that medium?

Answer 31

The cooler the material, the slower the speed of sound.

Question 32

What property of waves affect the speed of sound?

Answer 32

Frequency. The pitch of the sound is related to the frequency of the sound.

Question 33

How does the oscilloscope allow sound waves to be seen?

Answer 33

Oscilloscope changes the sound wave into an electrical signal.

Question 34

Echo

Answer 34

Reflected sound wave

Question 35

Echolocation

Answer 35

The process of using reflected sound waves to find objects; used by animals such as bats.

Question 36

Sonar

Answer 36

Type of electronic echolocation. Ultrasonic waves used to give detail about objects that they reflect off.

Question 37

Ultrasonography

Answer 37

Medical procedure that uses echoes to see inside a person's body without doing surgery

Question 38

Interference

Answer 38

The combination of two or more waves that result in a single wave.

Question 39

Sonic Boom

Answer 39

The explosive sound heard when a shock wave from an object traveling faster than the speed of sound reaches a person's ear.

Question 40

Standing Wave

Answer 40

A pattern of vibration that simulates a wave that is standing still.

Question 41

Resonance

Answer 41

A phenomenon that occurs when two objects naturally vibrate at the same frequency; the sound produced by one object causes the other object to vibrate.

Question 42

True or False: Echoes are reflect sound waves

Answer 42

True

Question 43

Some animals can use _______ to find food or to navigate around objects.

Answer 43

Echolocation. Some animals use echolocation to find food or navigate around objects.

Question 44

People use echolocation in many ________ applications.

Answer 44

Underwater. People use echolocation in may underwater applications.

Question 45

Sound barriers and shock waves are created by _______

Answer 45

Interference. Sound barriers and Shock waves are created by interference.

Question 46

________ waves form at an object's resonant frequencies.

Answer 46

Standing. Standing waves form at an object's resonant frequencies.

Question 47

What happens when a vibrating object causes a second object to vibrate at one of it's frequencies?

Answer 47

Resonance. Vibrating object can cause a second object to vibrate at one of it's resonant frequencies.

Question 48

When you pluck a string on a musical instrument, a _____ forms.

Answer 48

Standing wave. When you pluck a string in a musical instrument, a standing wave forms.

Question 49

What causes an echo?

Answer 49

reflection

Question 50

How do bats use echoes to find insects to eat?

Answer 50

Bats use echolocation to tell the bats if an insect is moving toward or away from them.

Question 51

Sound Quality

Answer 51

The result of the blending of several pitches through interference.

Question 52

Noise

Answer 52

The sound that consists of random mix of frequencies.

Question 53

True or false: Different instruments have same sound qualities.

Answer 53

False. Different instruments have different sound qualities.

Question 54

Sound Quality results from the _______ through interference of the fundamental and several overtones

Answer 54

Blending. Sound quality results from the blending through interference of the fundamental and several overtones.

Question 55

Name the three families of instruments.

Answer 55

1. String 2. Wind 3. Percussion

Question 56

Sound consisting of a random mix of frequencies is ______

Answer 56

Noise. Noise is a sound consisting of a random mix of frequencies.

Question 57

What interaction of sound waves determines sound quality?

Answer 57

Interference.

Question 58

Why do different instruments have different sound qualities?

Answer 58

Instruments vary in the part that vibrates and the way the vibration is made.