1 of 37

Thermal Radiation

  • What is this?
  • What is it used for?

Starter

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

2 of 37

Night Vision Equipment/ Thermal Scopes

All objects emit some thermal radiation.

The warmer the object, the more it emits.

Night vision equipment works by detecting the heat emitted by living things, rather than detecting light.

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

3 of 37

Thermal Radiation

  • Thermal radiation is the transfer of heat energy by infra-red (IR) waves.
  • Infrared waves can travel through a vacuum.
  • At the speed of light (300,000,000m/s).
  • Gases tend to allow radiation through better than liquids, liquids better than solids.

​

31-10-2021

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

4 of 37

31-10-2021

Which car will feel hotter?

Dark/ matte colours ABSORB thermal radiation.

Light/ shiny colours REFLECT thermal radiation.

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

5 of 37

Investigation: Radiation

  • Which types of colour and surface are the better reflectors of infrared radiation?
  • Which types of colour and surface are the better absorbers and emitters of radiation?
  • When filled with equal amounts of hot water, which jar will ‘cool down’ faster?

​

31-10-2021

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

6 of 37

Time (minutes)

Temperature (⁰C)

0

​

1

​

2

​

3

​

4

​

5

​

6

​

7

​

8

​

9

​

10

​

Time (minutes)

Temperature (⁰C)

0

​

1

​

2

​

3

​

4

​

5

​

6

​

7

​

8

​

9

​

10

​

Silver BT

Black BT

Time (minutes)

Temperature (⁰C)

0

​

1

​

2

​

3

​

4

​

5

​

6

​

7

​

8

​

9

​

10

​

White BT

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

7 of 37

HW

  • Plot the results in a graph.

​

  • How can you improve the quality of your results?

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

8 of 37

31-10-2021

Thermal radiation & temperature

All objects above absolute zero (-273 °C) give off thermal radiation.

The hotter an object the more radiation it gives off.

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

9 of 37

31-10-2021

Practical: Surface and emission

Dark surfaces emit radiation better than bright surfaces.

Radiation emitted by a perfect black body is called black body radiation – is extremely effective

​

​

​

Rough surfaces emit radiation better than polished surfaces.

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

10 of 37

Interpret the difference in the thermometer reading.

31-10-2021

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

11 of 37

31-10-2021

Practical: Absorption & Reflection

Dark surfaces absorb radiation best.

Bright surfaces reflect radiation best.

​

Rough surfaces absorb radiation best.

Polished surfaces reflect radiation best.

​

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

12 of 37

31-10-2021

Silvered surfaces: Thermal Reflectors

A metal kettle, a firefighter and a marathon runner make use of silvered surfaces.

Keep heat out

Keep heat in

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

13 of 37

Is the atmosphere an insulator?

What do you think the temperature would be on earth at night with no atmosphere?

​

-180 Celsius

​

The green house gases, however…….

31-10-2021

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

14 of 37

Peer Assessment

31-10-2021

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

15 of 37

PLENARY

3 keywords or basic facts

2 things you understand

1 question you still have

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

16 of 37

31-10-2021

Which ACP/VAA did you use today and how did you use it?

​

Click here to learn more about the ACPs

Click here to learn more about the VAAs

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

17 of 37

31-10-2021

#BeAmazingAtWIS

For the rest of this term, learning will not stop and neither will the amazing achievements of you and your peers.

​

Click Here to see the latest posts and remember to add #BeAmazingAtWIS to your posts so the community can share your successes with you too.

​

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

18 of 37

31-10-2021

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

19 of 37

31-10-2021

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

20 of 37

31-10-2021

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

21 of 37

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

22 of 37

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

23 of 37

31-10-2021

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

24 of 37

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

25 of 37

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

26 of 37

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

27 of 37

31-10-2021

Type question here

PLENARY

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

28 of 37

BRONZE

SILVER

GOLD

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

29 of 37

31-10-2021

SPICE-OMETER

MILD

MEDIUM

HOT

FIERY

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

30 of 37

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

31 of 37

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

32 of 37

31-10-2021

Plenary – Which are true which are false?

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

33 of 37

BRONZE

SILVER

GOLD

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

34 of 37

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

35 of 37

Plenary – Which are true which are false?

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

36 of 37

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation

37 of 37

Keywords: Radiation, EM waves, Surface Area, Emit, Absorption, Double Insulation, Efficiency

Describe how thermal energy transfer may take place by radiation

​

Explain how emission and absorption of radiation are related to surface and temperature

Explain ways of reducing unwanted energy transfer, such as insulation