Sounds

Question 1

Rarefraction

Answer 1

The wave lengths are nearer together

Question 2

Compression

Answer 2

The wave lengths are further apart

Question 3

The slinky like things are called

Answer 3

Wavelengths

Question 4

What type of wave is a sound wave

Answer 4

Longitudinal

Question 5

Students measuring the speed of sound in air
How can they determine the speed of sound

Answer 5

The speed of sound could be decided by timing how long it takes for the sound waves to travel a known distance through a medium

Question 6

Amplitude

Answer 6

The measurement from the top of the sound wave to the horizontal line

Question 7

Speed

Answer 7

Distance divided by time

Question 8

Distance

Answer 8

Speed times time

Question 9

Time

Answer 9

Distance divided by speed

Question 10

How to calculate mean

Answer 10

Add all the numbers and divide by how many there are

Question 11

How do echos happen

Answer 11

When sound waves are reverberated off surfaces

Question 12

How many seconds are in a minute

Answer 12

60 secs

Question 13

How many metres in a km

Answer 13

1000 metres

Question 14

What are the best surfaces for echos

Answer 14

Shiny and hard

Question 15

Why are soft surfaces not as good

Answer 15

They absorb the sound waves so the echo is not heard

Question 16

Why are uneven or rough surfaces bad

Answer 16

Because they scatter the sound waves so the echo is in all different directions so the sound is muffled

Question 17

Using echos to determine how far away objects are is called

Answer 17

Echolocation

Question 18

The smaller the sound waves the [……] the sound is

Answer 18

Quieter

Question 19

The taller the sound waves the […….] the sound is

Answer 19

Louder

Question 20

Pitch

Answer 20

How close the wave lengths are together

Question 21

Low pitch

Answer 21

The wave lengths are further apart

Question 22

High pitch

Answer 22

The wave lengths are closer together

Question 23

Frequency

Answer 23

How far apart the wave lengths are and how many per second or hz

Question 24

Low frequency

Answer 24

Less cycles (less amount of sound waves)

Question 25

High frequency

Answer 25

More cycles in the same amount of time

Question 26

A increase of loudness of 3dB will what the amount of time you can safely listen to it

Answer 26

Half the amount of time you can safely listen to it

Question 27

As you get older what do you loose the ability to hear

Answer 27

Higher pitches

Question 28

How can old people deal with hearing loss

Answer 28

Turn up the volume

Question 29

Humans can hear frequency’s of

Answer 29

20hz to 20,000hz

Question 30

Mach one

Answer 30

Is the speed of sound (transonic)

Question 31

What happens if you exceed Mach 1

Answer 31

You get supersonic speed

Question 32

How is sound made

Answer 32

Sound is made when the air particles around a object vibrate and the air vibrations enter your ear

Question 33

What vibrates in our ear when air vibrations enter

Answer 33

Ear drum

Question 34

How does sound enter our ear

Answer 34

Our eardrum send vibrations into our inner ear where little hairs vibrating and generate electrical signals that travel along the nerves to our brain so we get the sensation of hearing

Question 35

The bell Jar demonstration

Answer 35

Teacher created a vacuum using a bell jar with a bell inside the bell kept ringing in the vacuum and the belt did vibrate. The bell did get quieter and quieter though which meant sound waves ability to pass through a vacuum is incapable.

Question 36

Some sources of vibration

Answer 36

Singer-vocal cords Trumpet-lips Cello-string

Question 37

Why are waves longitudinal

Answer 37

Because the vibrations went back-and-forth, not up and down and parallel to where the sound moves

Question 38

Medium

Answer 38

Material sound travels through

Question 39

What material does sound travel fastest in?

Answer 39

Solid

Question 40

What material does sound travel slowest in?

Answer 40

Gas

Question 41

Why can’t sound travel through a vacuum?

Answer 41

Because a vacuum has no air, so the sound has no particles to vibrate off

Question 42

how to measure the speed of sound using echoes

Answer 42

Stand a distance from a wall one person hit two wooden blocks together so that an echo can be heard start the stopwatch on hearing the original sound stop the watch on hearing the echo repeat a couple times to eliminate any wrong times

Question 43

Echolocation uses echoes to calculate inaccessible distances some animals navigate using this method what are some?

Answer 43

Bats,whales,dolphins, dormice

Question 44

Air pressure is [……..] when particles are squeezed together

Answer 44

High

Question 45

Air pressure is [………] when particles are further apart

Answer 45

Low

Question 46

What causes reverberations?

Answer 46

When a sound is reflected or echoed off a surface