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Physics Y9 > Sound > Flashcards

Sound Flashcards

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1
Q

When are sounds made

A

When an object vibrates

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2
Q

What vibrates when these make these sounds
a)violin
b)singer
c)drum kit

A

a)strings
b)vocal cord
c)drum skins

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3
Q

In a spring why do the coil’s move back and fourth

A

Because the wave is moving along the spring

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4
Q

Sound travels in

A

Waves

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5
Q

What do waves do

A

Carry energy from one place to another

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6
Q

What type of wave is sound

A

A longitudinal wave

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7
Q

Longitudinal

A

The direction of the vibration is the same direction as the movement of the wave (parallel )

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8
Q

Sound travels through air as a series of

A

Compressions and rare factions

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9
Q

Compressions occur when

A

Particles are closest together

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10
Q

Rare factions occur when

A

Particles are furthest apart

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11
Q

What happens when air is removed from the bell jar

A

We can see the bell ring but can’t hear it

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12
Q

Sound needs what to be transmitted

A

Particles

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13
Q

Where does sound travel
a)fastest
b)slowest
c)not at all

A

a)solids
b)gases
c)vacuum

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14
Q

What makes up the outer ear

A

Pinna,ear canal and ear drum

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15
Q

What is the function of the pinnacle,ear canal and ear drum

A

Collect and funnel sound waves to ear drum

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16
Q

What is made by the body to keep the ear clean(what can be the issue)

A

Ear wax-there can be a build up sometimes

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17
Q

What 3 small bones make up the middle ear

A

Stirrup,hammer and anvil

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18
Q

What is the purposes of the middle ear

A

Amplifies the sound vibrations

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19
Q

What does the eustachian do

A

Connects to the throat and equalises the pressure

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20
Q

What makes up the inner ear

A

Semicircular canals
Auditory nerve
Cochlea

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21
Q

Where do the vibrations go beyond the oval window

A

The cochlea

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22
Q

What is found in the cochlea

A

Fluid and hairs(fibres)

23
Q

What do the fibres in the cochlea do

A

Sway in the fluid(sound moves it)which sends an electrical impulse to the brain 🧠

24
Q

Why does sound travel fastest in solids

A

Because the particles are packed tightly making it more dense therefore transmitting sound quicker

25
Q

What is the calculation for distance

A

Speed x time

26
Q

Sound needs what to travel

A

Medium or material

27
Q

What speed does light travel at

A

300,000,000m/s

28
Q

What speed does sound travel

A

330m/s

29
Q

What is the calculation for speed

A

Distance ➗ time

30
Q

Why does sound travel faster through warmer air than colder

A

warmer molecules move through air more quickly therefore transmitting sound quicker

31
Q

What speed does sound travel through
a)air
b)steel
c)lake water

A

a)340m/s
b)5000m/s
c)1500m/s

32
Q

Calculation for time

A

Distance ➗ speed

33
Q

Peak/creast

A

Tip of a wave

34
Q

Trough

A

Bottom of the wave

35
Q

The distance from peak to peak or trough to trough (length of 1 wave)

A

Wavelength

36
Q

Amplitude

A

The height of a peak in the wave

37
Q

Amplitude=

A

Loudnesses

38
Q

Pitch=

A

Frequency

39
Q

Louder sound
Quieter sound

A

Higher amplitude
Lower amplitude

40
Q

Higher pitch
Lower pitch

A

Higher frequency
Lower frequency

41
Q

What is the average sound range of a healthy human

A

20Hz to 20000Hz

42
Q

Sounds above 20000 are known as

A

Ultrasound

43
Q

Sounds below 20Hz are known as

A

Infrasound

44
Q

What are the 3 bones in the ear called

A

Ossicles

45
Q

Auditory nerve

A

Responsible for sending vibrations(sound waves)to the brain

46
Q

Ear drum

A

Thin piece of skin-like tissue that stretched across the opening between the ear canal and the middle ear 

47
Q

How do we hear

A

Sound waves travel through the air
The pinna Directs the waves into the ear canal
The waves make the eardrum vibrate
This Intern makes the small bones, vibrate,
The small bones make the cochlea vibrate,
The hairs on the cochlea turn the wave into an electrical impulse
The impulse travels along the auditory nerve to the brain 

48
Q

Frequency

A

The number of waves that pass a point every second

49
Q

What are high pressured areas called in a wave

A

Compression

50
Q

What are the low areas of pressure in a wave called? 

A

Rare faction

51
Q

What unit is frequency measured in?

A

Hertz(Hz)

52
Q

What do sound waves transmit to the particles they touch?

A

Energy

53
Q

Waves with a high frequency have
Waves with a lower frequency have

A

More energy
Less energy

Physics Y9 (4 decks)

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