GCSE Physics help (AQA P1)Watch
I tutor GCSE physics and I've got myself stuck on a question - it could just be me being stupid but I can't get my head around the mark scheme. I've inserted and attached it
The mark scheme gives the answers as:
I agree with the first two, but why won't they allow conductor for the third gap? Surely heat is being conducted away from the water and dissipated into the surroundings?
Any help would be much appreciated, thanks in advance!
in experiment 2 you start off with boiling water so the dull black surface is absorbing heat and then emitting (?)
whereas the shiny surface is a poor absorber and emitter of radiation because it just reflects it
conduction convection and radiation are different methods of heat transfer maybe thats why they wont allow conductor
Although Matt black surfaces are the best at absorbing heat, they are also the best at giving off heat (emitting).
Same with shiny reflective surfaces, they take in less heat and also give off less heat (Hence why a kettle is most commonly reflective)
The word conduction is normally used between solids/liquids. Think about it- If you're talking about energy moving from a solid to gas, what's the difference between conduction and convection?