Surfaces And Radiation Paper2 Flashcards
What is infrared radiation?
Electromagnetic waves that heat things up
Infrared radiation is part of the electromagnetic spectrum and is associated with thermal energy.
What does it mean to emit?
When something gives off something
Emission can refer to the release of energy in various forms, including radiation.
What does it mean to absorb?
When something takes in or soaks up something
Absorption refers to the process where materials take in energy, such as heat or light.
What is the purpose of the practical?
To find out how the colour and texture of the surface affects how much heat (radiation) is absorbed or emitted
This practical helps to understand the relationship between surface properties and thermal radiation.
Which surfaces absorb and emit more radiation?
Matt black surfaces
Matt black surfaces are more effective at absorbing and emitting radiation compared to shiny smooth surfaces.
What are some common apparatus used in this practical?
Thermometers
Thermometers measure temperature changes, which are essential for assessing heat absorption and emission.
What are independent variables in the experiment?
Surface colour and texture
Independent variables are those that are changed or controlled to test their effects on the dependent variable.
What are dependent variables in the experiment?
Amount of heat absorbed or emitted
Dependent variables are what you measure in the experiment and are affected by the independent variables.
What are control variables in the experiment?
Same sizes, same volumes, same thickness, starting temperature, etc.
Control variables are constants that ensure the experiment is fair and that the results are valid.
Why should you put lids on each container?
To reduce heat loss through convection
Lids help maintain temperature by minimizing heat exchange with the environment.
What is meant by repeatability in an experiment?
The ability to obtain the same results using the same method and conditions
Repeatability indicates the reliability of an experiment’s results.
What is reproducibility in an experiment?
The ability to obtain the same results using different methods or conditions
Reproducibility is important for validating findings across different studies or experiments.
What might cause variations in measurements when repeating the experiment?
Sources of error such as hard to read the temperature at exactly the right time, slightly different volumes, slightly different starting temperatures, containers may be warm already
These sources of error highlight the challenges in achieving precise measurements.
