What is the purpose of the Leslie Cube practical?
The method described here uses a Leslie cube. This is a metal cube with four different types of surface. It is filled with hot water to increase its temperature….Results.
| Surface type | Infrared intensity |
|---|---|
| shiny black | 14.2 |
| shiny silver | 3.8 |
How does a Leslies cube work?
The cube is made from a solid block of metal with a central cavity. In use, the cavity was filled with hot water; the entire cube has essentially the same temperature as the water.
How can you use the Leslie cube to investigate how different surfaces emit infrared?
Method
- Place a Leslie cube on a heat-resistant mat. Fill it, almost to the top, with boiling water and replace the lid.
- Leave for one minute.
- Use the infrared detector to measure the intensity of infrared radiation emitted from each surface, or the temperature of the surface.
What is the control variable in the Leslie cube experiment?
Experiment 1: Leslie Cube Dependent Variable: The temperature measured using an infra-red thermometer. Control Variables: The volume of the water in the Leslie cube. The temperature of the water.
What are the four sides of Leslie’s Cube?
The transfer of infrared radiation from a hot object to cooler surroundings can be investigated using a piece of apparatus called Leslie’s cube. This is a metal cube with four side prepared in different ways: black, white, shiny, or dull.
What two Colours should be used to paint a Leslie cube?
Leslie’s Cubes usually have four to six different surfaces/colours which radiate different levels of heat because of their individual properties. As a rule, if the surfaces are polished chrome, matt black, brushed chrome and dull metal, the matt black surface will radiate the most heat.
What are control variables in Leslie cube experiment?
Control Variables: The volume of the water in the Leslie cube. The temperature of the water. The distance between the infra-red thermometer and the Leslie cube.
What surfaces best emit infrared radiation?
Dark and matt surfaces are good absorbers and emitters of infrared radiation. Light and shiny surfaces are poor absorbers and emitters of infrared radiation. Light and shiny surfaces are good reflectors of infrared radiation.
Where does conduction occur?
Conduction is the process by which heat energy is transmitted through collisions between neighboring atoms or molecules. Conduction occurs more readily in solids and liquids, where the particles are closer to together, than in gases, where particles are further apart.
What Colour absorbs infrared radiation?
black
The more light the object absorbs, the more heat absorbed since light is energy. If you consider it a color, black absorbs the most heat. A black object absorbs all wavelengths of light and reflects none. Objects that are white, on the other hand, reflect all wavelengths of light and therefore absorb the least heat.
What are the colors of Leslie’s cube experiment?
One of the traditional experiments to show how objects emit heat is “Leslie’s Cube”. This is a metal cube that has the vertical sides in four “colours”. They are usually matt black, white, shiney (polished) and dull. Variants have gloss black and dull white.
How does a Leslie cube increase its temperature?
This is a metal cube with four different types of surface. It is filled with hot water to increase its temperature. To investigate how the amount of infrared radiation absorbed or radiated by a surface depends on the nature of that surface. Place a Leslie cube on a heat-resistant mat. Almost fill it with boiling water and replace the lid.
When did John Leslie invent the Leslie’s cube?
Leslie’s cube, first introduced by John Leslie in the early 19thcentury [2], provides an elegant way to experimentally demonstrate this fundamental law.
What are the control variables in Leslie cube?
Control Variables: The volumeof the waterin the Leslie cube. The temperatureof the water. The distance between the infra-red thermometerand the Leslie cube. Method A diagramshowing several sides of a Leslie cube. Pour hot waterinto the Leslie cubeuntil it is full. Use a rulerto measure10cm from one surface of the Leslie cube.