REQ.PRAC amount of infrared radiation absorbed or radiated by a surface

Question 1

method

Answer 1

1) take four boiling tubes each painted in a different colour: matt black, gloss black, white and silvered
2) pour hot water into each tube
3) measure and record start temp of each tube
4) measure temp of each tube every min for 10 mins
5) the tube that cools fastest, emits infrared energy quickest

Question 2

considerations

Answer 2

-evaporation can occur so to minimise this, block each tube with a plug of cotton wool

Question 3

hazards

Answer 3

-burning