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Physics > Sound > Flashcards

Sound Flashcards

1
Q

Sound travels through air as a series of what..

A

Compressions and rarefactions

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2
Q

When do compressions occur

A

When particles are closest together

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3
Q

Rarefactions occur when..

A

Particles are furthest apart

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4
Q

Sound travels fastest in..

A

Solids

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5
Q

Sound travels slowest in….

A

Gases

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6
Q

What does sound not at all travel in…

A

A vacuum

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7
Q

What 3 parts make up the outer ear

A

Pinna
Ear canal
Eardrum

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8
Q

What is the function of the pinna

A

Collects sound waves and channels them into the ear canal

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9
Q

What is the function of the ear canal

A

Transports sound from outer ear to eardrum

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10
Q

What is the function of the eardrum

A

Send vibrations to the inner ear

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11
Q

What is the name of the 3 small bones in the middle ear?

A

Stapes
Incus
Malleus

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12
Q

What is the purpose of the middle ear?

A

It transmits sound for outer ear into inner ear

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13
Q

What is the Eustachian tube for

A

Equalises pressure on the ear drum

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14
Q

Where do the vibrations go beyond the oval window

A

The cochlea

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15
Q

What is found in the cochlea

A

Fluid and hairs (fibres)

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16
Q

What do the fibres in the cochlea do?

A

Convert sound information from the hair cells to the brain

17
Q

Why does sound travel fastest in solids?

A

Because the sound vibrations are passed quickly when the particles are close together and bonded to one another

18
Q

Speed =

A

Distance divided by time

19
Q

Does sound travel faster In liquids or gases

A

Liquids

20
Q

Why does sound travel quicker in liquids than gases

A

Because the molecules are closer together in liquids

21
Q

What is the average hearing range for a healthy young person

A

20Hz - 20,000 Hz

22
Q

What are sounds with a frequency below 20Hz called

A

Infrasound

23
Q

What are sounds above 20,000Hz called

A

Ultrasound

Physics (16 decks)

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