Sound

Question 1

Light and water waves are what type of waves

Answer 1

Transverse

Question 2

Sound is what type of wave?

Answer 2

Longitudinal

Question 3

True or False, sound waves have vibrations that are parallel to the direction of the wave?

Answer 3

True - Longitudinal wave vibrations are parallel to the direction of the wave.

Question 4

Are the vibrations in Longitudinal waves parallel to the direction of energy transfer?

Answer 4

Yes

Question 5

Fill in the missing word:

Sound travels as a Longitudinal P_______ Wave

Answer 5

Sound travels as a Longitudinal Pressure Wave.

Question 6

Why does sound require a medium to travel through?

Answer 6

Something has to pass on the sound vibration.

Question 7

Why can’t sound travel in space?

Answer 7

Space is mostly a vacuum, which means there are no particles to pass on the vibrations.

Question 8

Vibrations are passed through mediums as a series of what?

Answer 8

Compressions.

Question 9

What are compressions in sound waves?

Answer 9

regions of squashed up particles.

Question 10

Can sound be reflected and refracted like light?

Answer 10

Yes

Question 11

Give an example of a sound reflection.

Answer 11

Echo

Question 12

Give an example of objects around the home that absorb sound easily.

Answer 12

Soft furnishings - Carpets, curtains.

Question 13

Does the medium that sound is passing through affect the speed at which it travels?

Answer 13

Yes

Question 14

Fill in the missing words:

The ____ particles there are, the faster a sound wave ______.

Answer 14

The MORE particles there are, the faster a sound wave TRAVELS.

Question 15

Does sound usually travel faster in solid or gases?

Answer 15

Solids

Question 16

Does sound usually travel faster in more or less dense mediums?

Answer 16

More

Question 17

Does sound or light travel faster?

Answer 17

Light

Question 18

Does sound travel faster in Wood or Water?

Answer 18

Wood.

Question 19

The frequency of sound can be described as the number of complete _______ that pass a point per second.

Answer 19

waves

Question 20

Does high or low frequency mean more vibrations per second?

Answer 20

High

Question 21

What is frequency measure in?

Answer 21

Hertz (Hz)

Question 22

Hertz (Hz) is the number of what per second?

Answer 22

vibrations.

Question 23

Put the following stages of hearing sound in the right order:
A)Ear Bones vibrate
B) Object vibrates
C) Ear drum vibrates
D) Hairs vibrate in the cochlea, sending a mesage to the brain along the auditory nerve.
E) Air Vibrates

Answer 23

B, E, C, A, D

Question 24

What is described here:

The range of frequencies that you can hear.

Answer 24

Auditory range.

Question 25

What is the typical auditory range of humans?

Answer 25

20 - 20,000 Hz

Question 26

Can humans typically hear high pitched sounds above 20,000 Hz?

Answer 26

No

Question 27

Do all humans have the same auditory range?

Answer 27

No

Question 28

Can animals like dogs and bats usually hear higher frequency sounds than humans?

Answer 28

Yes

Question 29

Can dolphins usually hear lower pitch sounds than humans?

Answer 29

No

Question 30

Is the pitch of sound different to the frequency?

Answer 30

They are related, but pitch is a perceptual quality, while frequency is the scientific measurable attribute of the sound.

Question 31

How do sound waves transfer energy and information from one place to another?

Answer 31

by vibrations between particles - pressure changes.

Question 32

What is the name of the thin membrane of material within a microphone that receives the sound wave vibrations?

Answer 32

A diaphragm

Question 33

What does a microphone convert sound wave vibrations to?

Answer 33

Electric signals

Question 34

What does the the recording of electric signals from a microphone allow us to do?

Answer 34

reproduce the sound later.

Question 35

What do loudspeakers do?

Answer 35

Recreate sound waves from electrical signals

Question 36

What does a loudspeaker use to vibrate the air and reproduce sound waves?

Answer 36

a diaphragm

Question 37

What is ultrasound?

Answer 37

High frequency sound that we can't hear - higher frequency than the normal auditory range of humans - Sound over 20,000Hz

Question 38

What is ultrasound cleaning?

Answer 38

the frequent vibrations of the pressure waves dislodge dirt in difficult to clean cracks.

Question 39

Give an example of items that are sometimes cleaned using ultrasonic cleaning.

Answer 39

Jewellery, teeth, fountain pen nibs

Question 40

What is Ultrasound physiotherapy?

Answer 40

Ultrasound pressure waves transfer energy through matter, and can reach inside the body.

Question 41

Some physiotherapists believe that ultrasound therapy can treat difficult to reach muscles and tendons inside the body, do scientists agree?

Answer 41

No, scientists have found little evidence that this is an effective treatment.