Radiation and Absorption

• What is the first step of the practical using a Leslie cube?

  Place a Leslie cube on a heatproof mat
• Why is hot water used in the Leslie cube experiment?

  To measure emitted radiation from surfaces
• What tool is used to measure radiation from the Leslie cube?

  Infrared detector
• What should be done after measuring radiation from each side of the Leslie cube?

  Draw a suitable chart to compare results
• What is a Leslie cube?

  A cube with different textured surfaces
• What surfaces does a Leslie cube typically have?

  Matt white, shiny silver/gold, matt black, shiny black
• Why is a heatproof mat used in the experiment?

  To protect the desk from heat
• What type of data is collected from the Leslie cube experiment?

  Categorical data
• What type of chart is suitable for displaying the data from the experiment?

  Bar chart
• What should be on the y-axis of the bar chart?

  Radiation intensity
• Which surface is expected to emit the most radiation?

  The matt black surface
• Why do matt black surfaces emit more radiation?

  They are good absorbers and emitters
• Which surfaces are expected to emit the least radiation?

  The shiny surfaces
• Why do shiny surfaces emit less radiation?

  They are good reflectors and poor emitters
• What type of radiation is emitted from the Leslie cube?

  Infrared radiation
• What is infrared radiation part of?

  The electromagnetic spectrum
• What apparatus is useful when filling the Leslie cube?

  A funnel
• Why is a funnel used when filling the cube?

  To reduce the likelihood of spillages
• Why should you avoid handling the Leslie cube with bare hands?

  It will be very hot
• What safety precaution should be taken with the Leslie cube?

  Avoid handling it with bare hands