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Year 9 Science > Physics - Sound > Flashcards

Physics - Sound Flashcards

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1
Q

propagation

A

transmission of sound through a medium

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2
Q

Waves transfer

A

Energy without transferring matter

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3
Q

Waves transfer through

A

Solids, gasses, liquids, vacuums (empty spaces)

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4
Q

Frequency

A

Total waves that pass through a fixed point usually in one second

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5
Q

Period

A

The time taken for a wave to complete a cycle

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6
Q

Crest

A

Point where maximum displacement occurs

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7
Q

Trough

A

Point where minimum displacement occurs

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8
Q

Compression

A

Point in which particles are closest to each other

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9
Q

Rarefraction

A

Point in which particles are furthest from each other

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10
Q

How is sound produced

A

When matter vibrates

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11
Q

Speed of sound varies depending on?

A

the medium it travels through

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12
Q

Why does sound travel through solids fastest

A

because the particles are the densest and oscillate the most

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13
Q

Why does sound travel through warmer air faster

A

because the particles have more kinetic energy and bump into each other more

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14
Q

Why does sound travel through warmer air faster

A
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15
Q

Why does sound disappear

A

Inverse Square Law
Absorption
Reflection
Scattering and difraction

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16
Q

What is the inverse square law

A

sound energy gets spread over a larger area as it propagates, resulting in a decrease in its volume.

17
Q

Why do some materials absorb sound better than others

A

some are able to dissipate and convert the energy into heat energy rather than reflect it

18
Q

What causes echoes

A

When sound bounces off an extremely dense and reflective material back toward the source because it doesn’t have the space to hold the energy

19
Q

What is the common feature needed for material to absorb sound?

A

Porosity, to trap the sound

20
Q

How does sonar work

A

Records how long echo takes to return to its origin

21
Q

How fast does sound travel in water

A

1500 m/s

22
Q

Ultrasound

A

Term for sounds above our normal hearing range

23
Q

How does ultrasound work

A

Sound waves pass through soft tissue but reflect off organs and the foetus

24
Q

Relationship between frequency and period

A

p=1/f

25
Q

to measure the length of a wave

A

every 2 intercepts

Year 9 Science (9 decks)

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