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Year 9 Physics > Year9Sound > Flashcards

Year9Sound Flashcards

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1
Q

Sounds are caused by ..?.. objects

A

vibrating

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2
Q

Sound waves are ..?.. waves

A

longitudinal

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3
Q

All waves including sound waves carry ..?..

A

energy

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4
Q

The part of a sound wave where particles are squeezed closer together than normal is called a …?

A

compression

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5
Q

The part of a sound wave where particles are farther apart than normal is called a …?

A

rarefaction

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6
Q

In a longitudinal wave the direction of particle vibration is ..?.. to the direction of wave travel.

A

parallel

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7
Q

The speed of sound in a liquid is ..?.. than its speed in a gas

A

higher

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8
Q

The speed of sound in a liquid is ..?.. than its speed in a solid

A

lower

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9
Q

The equation to calculate speed

A

speed = distance travelled / time taken

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10
Q

Sound will ..?.. off any hard surface

A

reflect

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11
Q

When sound reflects it causes an …?

A

echo

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12
Q

In an echo situation the distance to the reflecting surface equals

A

1/2 x echo time x speed of sound

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13
Q

Sound cannot travel through a …?

A

vacuum

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14
Q

Sound will travel ..?.. through any material in which the molecules are closer together.

A

faster

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15
Q

Sound can only travel if there are ..?.. to vibrate

A

particles

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16
Q

The speed of sound in air is about …?

A

330 m/s

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17
Q

The speed of ..?.. is about one million times the speed of sound

A

light

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18
Q

Sound waves can be displayed using a microphone connected to an …?

A

oscilloscope

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19
Q

The number of waves created per second or passing a point per second is called the wave …?

A

frequency

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20
Q

Frequency is measured in …?

A

Hertz (Hz)

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21
Q

The distance from one compression or rarefaction to the next one in a sound wave is called the …?

A

wavelength

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22
Q

The unit for wavelength is the …?

A

metre (m)

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23
Q

The maximum distance moved by each vibrating particle in a sound wave is called the ..?.. of the wave.

A

amplitude

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24
Q

The unit for amplitude is the …?

A

metre (m)

25
Q

On an oscilloscope a wave with a large amplitude will look …?

A

tall

26
Q

On an oscilloscope a wave with a large frequency will look …?

A

narrow

27
Q

The loudness of a note is controlled by the ..?.. of the sound wave.

A

amplitude

28
Q

The note caused by a sound wave with a large amplitude will sound …?

A

loud

29
Q

The pitch of a note is controlled by the ..?.. of the sound wave.

A

frequency

30
Q

A high-pitched note is caused by a sound wave with a high…?

A

frequency

31
Q

A guitar and a trumpet playing the same note sound different because their notes have different …?

A

quality

32
Q

The outer part of the ear that funnels the sound waves is called the …?

A

Pinna

33
Q

On the way into the ear the sound waves travel along the …?

A

ear canal

34
Q

The flap of skin across the end of the ear canal is called the …?

A

ear drum

35
Q

Sound waves make the ear drum …?

A

vibrate

36
Q

The set of bones behind the ear drum is called the …?

A

ossicles

37
Q

When the ear drum vibrates it makes the ossicles …?

A

vibrate

38
Q

The ossicles ..?.. the vibrations and pass them on.

A

amplify

39
Q

The ossicle connected to the eardrum is called the …?

A

hammer

40
Q

The ossicle connected to the oval window is called the …?

A

stirrup

41
Q

The oval window is in the side of the …?

A

Cochlea

42
Q

The ossicles make the ..?.. vibrate

A

Oval window

43
Q

The area of the oval window is ..?.. than the area of the ear drum

A

smaller

44
Q

The ..?.. is shaped like a snail’s shell

A

Cochlea

45
Q

The Cochlea is filled with …?

A

liquid

46
Q

When the oval window vibrates it causes ..?.. in the liquid in the Cochlea

A

vibrations

47
Q

The Cochlea is lined with …?

A

nerve cells

48
Q

The vibrations in the Cochlear fluid cause the nerve cells to create an electrical …?

A

signal

49
Q

The signal from the nerve cells in the Cochlea is sent to the …?

A

brain

50
Q

The signals are carried from the Cochlea to the brain along the …?

A

auditory nerve

51
Q

The brain interprets the nerve signals from the ear as …?

A

sounds

52
Q

A hearing problem that involves a ringing in the ear and that is caused by regular exposure to loud noises is called …?

A

Tinnitus

53
Q

Poor hearing caused by old age is due to limited movement of the …?

A

ossicles

54
Q

Noise is ..?.. sound.

A

unwanted

55
Q

A sudden very loud noise can cause a …?

A

perforated ear drum

56
Q

Regular exposure to high volume noise can cause …?

A

deafness

57
Q

People working in environments where the noise levels are high should wear …?

A

ear protectors

58
Q

The loudness of a sound is measured using a …?

A

sound-level meter

59
Q

The unit for measuring loudness is the …?

A

decibel (dB)

Year 9 Physics (5 decks)

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