Radiation

What the syllabus asks of you

• Know that thermal radiation is infrared radiation and that all objects emit this radiation
• Know that thermal energy transfer by thermal 4 Know that for an object to be at a constant radiation does not require a medium temperature it needs to transfer energy away from the object at the same rate that it receives energy
• Describe the effect of surface colour (black 5 Know what happens to an object if the rate at or white) and texture (dull or shiny) on the which it receives energy is less or more than emission, absorption and reflection of infrared the rate at which it transfers energy away from radiation the object 6 Know how the temperature of the Earth is affected by factors controlling the balance between incoming radiation and radiation emitted from the Earth’s surface continued Core Supplement 7 Describe experiments to distinguish between good and bad emitters of infrared radiation 8 Describe experiments to distinguish between good and bad absorbers of infrared radiation 9 Describe how the rate of emission of radiation depends on the surface temperature and surface area of an object