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Physics⚡️ > Chapter 2 🖕🏼 > Flashcards

Chapter 2 🖕🏼 Flashcards

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1
Q

How does loft insulation work?

A

Reduces energy lost through roof by conduction

Fibreglass is a good insulator

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2
Q

How does cavity wall insulation work?

A

Reduces energy lost through outer wall of house

Insulation fills cavity so heat can’t escape easily

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3
Q

How does putting aluminium foil between a radiator and the wall help?

A

Foil reflects heat away from wall

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4
Q

How do double glazed windows help?

A

Reduces energy lost through conduction

Two panes of glass with vacuum between

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5
Q

Ways to insulate house

A 
Loft insulation 
Cavity wall insulation 
Double glazed Windows 
Aluminium behind radiators 
Thicker bricks on external walls
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6
Q

When a substance is heated, what does the temperature rise depend on?

A

Amount of energy supplies to it
Mass of substance
What the substance is

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7
Q

What is the specific heat capacity of a substance?

A

The energy needed to raise temperature of 1kg of the substance by 1 degree

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8
Q

What is the equation for energy transferred (J) using mass, SHC and temperature change

A

Energy transferred = mass x SHC x temperature change

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9
Q

When does the temperature of an object increase?

A

When it absorbs more radiation than it emits

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10
Q

What does the temperature of the earth depend on?

A

Absorption and emission of infrared radiation

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11
Q

What do all objects emit?

A

Infrared radiation

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12
Q

The higher the temperature of an object…

A

The more infrared radiation it emits

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13
Q

What is a perfect black body?

A

An object that absorbs all radiation that hits it

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14
Q

How does cavity wall insulation work?

A

Reduces energy lost through outer wall of house

Insulation fills cavity so heat can’t escape easily

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3
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15
Q

How does putting aluminium foil between a radiator and the wall help?

A

Foil reflects heat away from wall

How well did you know this?
1
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2
3
4
5
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16
Q

How do double glazed windows help?

A

Reduces energy lost through conduction

Two panes of glass with vacuum between

How well did you know this?
1
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2
3
4
5
Perfectly
17
Q

Ways to insulate house

A 
Loft insulation 
Cavity wall insulation 
Double glazed Windows 
Aluminium behind radiators 
Thicker bricks on external walls
How well did you know this?
1
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2
3
4
5
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18
Q

When a substance is heated, what does the temperature rise depend on?

A

Amount of energy supplies to it
Mass of substance
What the substance is

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19
Q

What is the specific heat capacity of a substance?

A

The energy needed to raise temperature of 1kg of the substance by 1 degree

How well did you know this?
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3
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20
Q

What is the equation for energy transferred (J) using mass, SHC and temperature change

A

Energy transferred = mass x SHC x temperature change

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21
Q

When does the temperature of an object increase?

A

When it absorbs more radiation than it emits

How well did you know this?
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22
Q

What does the temperature of the earth depend on?

A

Absorption and emission of infrared radiation

23
Q

What do all objects emit?

A

Infrared radiation

24
Q

The higher the temperature of an object…

A

The more infrared radiation it emits

25
Q

What is a perfect black body?

A

An object that absorbs all radiation that hits it

26
Q

How does loft insulation work?

A

Reduces energy lost through roof by conduction

Fibreglass is a good insulator

27
Q

How does cavity wall insulation work?

A

Reduces energy lost through outer wall of house

Insulation fills cavity so heat can’t escape easily

28
Q

How does putting aluminium foil between a radiator and the wall help?

A

Foil reflects heat away from wall

29
Q

How do double glazed windows help?

A

Reduces energy lost through conduction

Two panes of glass with vacuum between

30
Q

Ways to insulate house

A 
Loft insulation 
Cavity wall insulation 
Double glazed Windows 
Aluminium behind radiators 
Thicker bricks on external walls
31
Q

When a substance is heated, what does the temperature rise depend on?

A

Amount of energy supplies to it
Mass of substance
What the substance is

32
Q

What is the specific heat capacity of a substance?

A

The energy needed to raise temperature of 1kg of the substance by 1 degree

33
Q

What is the equation for energy transferred (J) using mass, SHC and temperature change

A

Energy transferred = mass x SHC x temperature change

34
Q

When does the temperature of an object increase?

A

When it absorbs more radiation than it emits

35
Q

What does the temperature of the earth depend on?

A

Absorption and emission of infrared radiation

36
Q

What do all objects emit?

A

Infrared radiation

37
Q

The higher the temperature of an object…

A

The more infrared radiation it emits

38
Q

What is a perfect black body?

A

An object that absorbs all radiation that hits it

39
Q

What is a conductor?

A

Something that lets energy travel through it

40
Q

A good insulator must have…

A

Low thermal conductivity

41
Q

What is conduction?

A

Where vibrating particles transfer energy to neighbouring particles

42
Q

What is the thermal conductivity of a material

A

How much energy it transfers per second by conduction

43
Q

What does the energy transfer through a layer of material depend on 3

A

Temperature difference
Thickness
Thermal conductivity

44
Q

Why does the colour of an object change as it is heated?

A

It emits more radiation at shorter wavelengths

45
Q

What type of radiation does earth emit?

A

Long wave

46
Q

How to reduce energy transfer? 2

A

The thermal conductivity of the material should be as low as possible
The thickness of the insulating layer should be as big as possible

47
Q

What will an object with a constant temperature do?

A

Emit radiation across a continuous range of wavelengths

48
Q

What do greenhouse gases do?

A

It absorbs long wave length tradition from earth to stop it reflecting into space

49
Q

How do solar panels work?

A

Absorb infrared radiation from the sun to generate electricity or heat water

50
Q

How to reduce energy transfer? 2

A

The thermal conductivity of the material should be as low as possible
The thickness of the insulating layer should be as big as possible

51
Q

What will an object with a constant temperature do?

A

Emit radiation across a continuous range of wavelengths

52
Q

What do greenhouse gases do?

A

It absorbs long wave length tradition from earth to stop it reflecting into space

53
Q

How do solar panels work?

A

Absorb infrared radiation from the sun to generate electricity or heat water

Physics⚡️ (16 decks)

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