R. Practical- Radiation and Absorption

• 1. Place the Leslie Cube on a heat proof mat.
  2. Fill the Leslie Cube with very hot water and replace the lid.
  3. Use an infrared detector to record the amount of radiation from each surface. The detector should be the same distance from each surface.
  4. Construct bar chart to display the results.
• What are the 4 surfaces on a Leslie Cube?

  1. Matt white
  2. Shiny black
  3. Matt Black
  4. Shiny silver
• What would you use to measure infrared radiation emitted?

  Infrared detector
• What is the independent variable?

  Type of surface
• What is the dependent variable?

  Temperature measured by infrared detector
• What are the control variables?

  1. Distance between detector and surface
  2. Temperature of water inside
  3. Size of cube
  4. Volume of hot water inside cube
• What emits infrared radiation at the greatest rate?

  Black
• Why is there a heat proof mat?

  Reduce heat loss through base
• Are matt or shiny surfaces better emitters?

  Matt
• Are matt or shiny better absorbers?

  Matt
• Which surface emits infrared radiation at the slowest rate?

  White shiny surfaces
• Why should you leave the Leslie Cube for a minute after placing hot water?

  To allow surfaces to heat up to temperature of water
• Risks

  1. Burns
  2. Scalds
• What is a Leslie Cube?

  Hollow metal container with painted sides