1.  Fill in the gaps in the following statements:

      Thermal radiation is energy transfer by             .

      A dull black surface is a               absorber of radiation.

      A bright shiny surface is a            absorber of radiation.

 2.  Why does a skier's jacket have a shiny surface?

 3.  Explain how the surface of a radiator transfers energy to the surroundings?

 4.  How can people be seen in darkness?    

 5.  How Science Works

      Kate investigates what colour of a surface is a good absorber of heat.

      a) What is the independent variable?

      b) What type of variable is the answer to a)?

      c) What is the dependent variable?

      d) What type of variable is the answer to c)?

 6.  What type of electromagnetic wave is emitted from a remote control?

 7.  Explain how infrared is used in cooking.