1. Thermal radiation is energy transfer by waves.        A dull black surface is a good absorber of radiation.        A bright shiny surface is a poor absorber of radiation.    2. A skier's jacket has a shiny surface to reduce heat loss by radiation.    3. The surface of a radiator transfers energy to the surroundings by infra red waves passing         through the air.    4. People can be seen in darkness through Infra-red camera which detect the heat emitted from        people's bodies.        5. How Science Works        Kate investigates what colour of a surface is a good absorber of heat.        a) The independent variable is the colour of the surface.        b) The colour of the surface is a categoric variable.        c) The dependent variable is temperature.        d) Temperature is a continuous variable.    6. The electromagnetic wave emitted from a remote control is infrared.    7. Infrared is only absorbed by the particles on the surface of the food (does not penetrate), their        kinetic energy increases and this energy is transferred to the rest of the food by conduction.