You Can Investigate Emission of Thermal Radiation With a Leslie Cube Flashcards
What is a Leslie cube?
A hollow, watertight, metal cube made of e.g aluminium, whose four vertical faces have different surfaces
What can you use Leslie cubes to investigate?
Infrared emission by different surfaces
1) where do you place the empty Leslie cube?
On a heat-proof mat
2) what do you do second? (Boil)
Boil water in a kettle and fill the Leslie cube with boiling water
3) what do you wait for and then what do you do once this has happened?
The cube to warm up, then hold a thermometer against each four vertical faces of the cube
3) what should you find about all four faces?
They are all the same temp
4) what do you with an infrared detector?
Hold it at a set distance away from one of the cubes vertical faces, and record the amount of IR radiation it detects
5) what do you do with this measurement?
Repeat it for each of the cube’s vertical faces
5) what do you need to make sure you do with the detector?
Keep the position at the same distance from the cube each time
6) what should you detect more infrared radiation from?
More from the black surface than the white, and more from the matt surfaces than the shiny ones
7) why should you do the experiment more than once?
To make sure your results are repeatable
8) what precautions should you take when doing this experiment?
- don’t move cube with hands when full of boiling water
- be careful when carrying full kettle
