RP: how different surfaces affect infrared intensity

• What does the amount of infrared radiation absorbed or radiated by a surface depend on?

  The nature of that surface
• How does the Earth's temperature relate to infrared radiation?

  It depends on the rates at which light and infrared radiation are absorbed by the Earth's surface and atmosphere
• What is the aim of the experiment using a Leslie cube?

  • To investigate how the amount of infrared radiation absorbed or radiated by a surface depends on the nature of that surface.
• What apparatus is used to measure infrared radiation in the experiment?

  An infrared detector
• What is the first step in the method of the experiment with the Leslie cube?

  Place a Leslie cube on a heat-proof mat
• Why is it important to leave the Leslie cube for one minute before taking measurements?

  To enable the surfaces to heat up to the temperature of the water
• Why must the infrared detector be placed the same distance from each surface?

  To ensure consistent readings of infrared intensity
• What are the example results of infrared intensity for different surface types?

  • Matt black: 19.5 W/m²
  • Matt white: 5.1 W/m²
  • Shiny black: 14.2 W/m²
  • Shiny silver: 3.8 W/m²
• How should the results of the infrared intensity experiment be recorded?

  In a suitable table
• What should be done with the results after recording them?

  Plot a bar chart to show the results
• What is the purpose of ordering the different surfaces from best to worst emitter of infrared radiation?

  To analyze the effectiveness of each surface in emitting infrared radiation
• What hazards are associated with the experiment using boiling water?

  • Scalds from boiling water
  • Control measures: Pour water slowly, using a funnel if necessary; do not move the Leslie cube until it has cooled.
• What is the consequence of the hazard of boiling water in the experiment?

  Scalds
• What control measures should be taken to prevent scalds from boiling water?

  Pour water slowly, using a funnel if necessary, and do not move the Leslie cube until it has cooled
• What are the key components of the experiment to measure infrared radiation absorption?

  • Use of a Leslie cube with different surfaces
  • Heating the cube with boiling water
  • Measuring infrared intensity with a detector
  • Recording and analyzing results