1. How does the Sun’s heat energy reach Earth?
Conduction?
Convection?

2. Lesson Outcomes
What materials/colours are good absorbers and emitters of infrared radiation? GRADE D
What materials/colours are good reflectors of infrared radiation? GRADE D
What is infrared radiation? GRADE C
Explain why money savers put silver sheets on the wall behind their radiators GRADE B

3. All objects emit and absorb infrared radiation.
The hotter an object, the more radiation it emits every second.
Clipbank: seeing in the dark

7. Dull (matt) dark surfaces are better absorbers of infrared radiation than shiny light surfaces.
Which metal block will heat up quicker?
If you lived in a hot country, would you paint your house a light colour or a dark colour?

8. Dull (matt) dark surfaces are better emitters of infrared radiation than shiny light surfaces.
Hot tea 62ºC
Which tea cup will lose heat quicker?
If you had a food home delivery business, would you deliver the hot food in dark coloured containers or Aluminium foil?

9. Time (mins)
Temperature (°C)
BLACK PAPER
FOIL 2 4 6 8

10. Lesson Outcomes
What materials/colours are good absorbers and emitters of infrared radiation? GRADE D
What materials/colours are good reflectors of infrared radiation? GRADE D
What is infrared radiation? GRADE C
Explain why money savers put silver sheets on the wall behind their radiators GRADE B