Infrared Radiation

All objects continually ____ and _____ IR

emit

absorb

Objects that are hotter than their surroundings

emit IR at a higher rate than they absorb it

Objects that are cooler than their surroundings

absorb IR at a higher rate than they emit it

Objects at a constant temperature

emit and absorb IR at the same rate

Best emitters and absorbers

Black and Matt

Best emitters and absorbers

White and Shiny

Method for finding the IR emitted by different surfaces of a Leslie Cube

1. Place a Leslie Cube on a heatproof matt

2. Slowly fill cube with boiling water from a kettle using a funnel to avoid scalding yourself

3. Replace the lid on the cube and leave for 1 minute to allow the surface to heat up to the temperature of the water

4. Use an infrared detector to measure the intensity of infrared radiation emitted from each surface, ensuring that the detector is the same distance from each surface for consistent readings.

   Do not touch the cube as it is very hot

5. Plot a bar chart of results to compare