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Physics⚡️ > Chapter 2 🖕🏼 > Flashcards

Chapter 2 🖕🏼 Flashcards

(53 cards)

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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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15
Q

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

A

Foil reflects heat away from wall

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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

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17
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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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

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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

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22
Q

What does the temperature of the earth depend on?

Study These Flashcards
A

Absorption and emission of infrared radiation

23
Q

What do all objects emit?

Study These Flashcards
A

Infrared radiation

24
Q

The higher the temperature of an object…

Study These Flashcards
A

The more infrared radiation it emits

25
What is a perfect black body?
An object that absorbs all radiation that hits it
26
How does loft insulation work?
Reduces energy lost through roof by conduction | Fibreglass is a good insulator
27
How does cavity wall insulation work?
Reduces energy lost through outer wall of house | Insulation fills cavity so heat can't escape easily
28
How does putting aluminium foil between a radiator and the wall help?
Foil reflects heat away from wall
29
How do double glazed windows help?
Reduces energy lost through conduction | Two panes of glass with vacuum between
30
Ways to insulate house
``` Loft insulation Cavity wall insulation Double glazed Windows Aluminium behind radiators Thicker bricks on external walls ```
31
When a substance is heated, what does the temperature rise depend on?
Amount of energy supplies to it Mass of substance What the substance is
32
What is the specific heat capacity of a substance?
The energy needed to raise temperature of 1kg of the substance by 1 degree
33
What is the equation for energy transferred (J) using mass, SHC and temperature change
Energy transferred = mass x SHC x temperature change
34
When does the temperature of an object increase?
When it absorbs more radiation than it emits
35
What does the temperature of the earth depend on?
Absorption and emission of infrared radiation
36
What do all objects emit?
Infrared radiation
37
The higher the temperature of an object...
The more infrared radiation it emits
38
What is a perfect black body?
An object that absorbs all radiation that hits it
39
What is a conductor?
Something that lets energy travel through it
40
A good insulator must have...
Low thermal conductivity
41
What is conduction?
Where vibrating particles transfer energy to neighbouring particles
42
What is the thermal conductivity of a material
How much energy it transfers per second by conduction
43
What does the energy transfer through a layer of material depend on 3
Temperature difference Thickness Thermal conductivity
44
Why does the colour of an object change as it is heated?
It emits more radiation at shorter wavelengths
45
What type of radiation does earth emit?
Long wave
46
How to reduce energy transfer? 2
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
What will an object with a constant temperature do?
Emit radiation across a continuous range of wavelengths
48
What do greenhouse gases do?
It absorbs long wave length tradition from earth to stop it reflecting into space
49
How do solar panels work?
Absorb infrared radiation from the sun to generate electricity or heat water
50
How to reduce energy transfer? 2
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
What will an object with a constant temperature do?
Emit radiation across a continuous range of wavelengths
52
What do greenhouse gases do?
It absorbs long wave length tradition from earth to stop it reflecting into space
53
How do solar panels work?
Absorb infrared radiation from the sun to generate electricity or heat water

Physics⚡️ (16 decks)

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