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Science Yr 9 > Chapter 3 > Flashcards

Chapter 3 Flashcards

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Biology 101 flashcards
1
Q

What is heat?

A

A form of energy that can be transferred through solids, liquids and gasses

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2
Q

What does heating a substance do to it?

A

Adds energy to the particles

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3
Q

What happens if the temperature increases?

A

The particles move faster and the substance expands

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4
Q

How are the particles in solids?

A

Closely Compact

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5
Q

How are the particles in liquids?

A

Compact, but move nad flow over each other

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6
Q

How are the particles in gasses?

A

Free to move around, not bound

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7
Q

How does the states of matter change?

A

Sufficient heat

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8
Q

What are the types of energy transfer?

A

Conduction, convection and radiation

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9
Q

How does conduction happen?

A

When the vibrations of heated solids move across the solid

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10
Q

What are substances that transfer heat easily called?

A

Conductors

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11
Q

What are substances that transfer heat poorly called?

A

Insulators

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12
Q

How does radiation happen?

A

When heat is transferred via invisible waves. It does not rely on particles, so it can travel through empty space

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13
Q

How does convection happen?

A

When fluids are heated and they gain energy, moving further apart, less dense and rise. Cooler fluids do the opposite

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14
Q

Why is shade cooler?

A

The radiation waves are blocked

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15
Q

What happens when radiated energy hits a surface?

A

The heat is absorbed, reflected or transmitted

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16
Q

What types of colours are good absorbers of radiation?

A

Dark-coloures ones

17
Q

How is sound produced?

A

When something vibrates

18
Q

How does speech produce sound?

A

Flaps of skin vibrating

19
Q

How does a drum produce sound?

A

A drum skin

20
Q

How does a piano produce sound?

A

String inside a piano gets hit with a hammer

21
Q

How does a saxophone produce sound?

A

A reed inside the mouthpiece

22
Q

How does a car stereo system produce sound?

A

A speaker cone

23
Q

How does a bell produce sound?

A

The metal casing of the bell

24
Q

How are sound waves transmitted?

A

Longitudinal waves

25
Q

Where do sound waves travel?

A

Away from the sound source

26
Q

What does sound energy need to be produced?

A

A medium (or material) which contains particles that can compress and spread out

27
Q

What does the material affect?

A

The speed of the sound

28
Q

Speed of sound through air at 0 degrees

A

331m/s

29
Q

Speed of sound through air at 18 degrees

A

342m/s

30
Q

Speed of sound through water

A

1440m/s

31
Q

Speed of sound through wood

A

4500m/s

32
Q

Speed of sound through steel

A

5100m/s

33
Q

Speed of sound through glass

A

5200m/s

34
Q

What materials reflect (echo) sound?

A

Hard surfaces

35
Q

What materials absorb sound?

A

Fabric, carpet and cushions

Science Yr 9 (7 decks)

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