Cambridge Secondary (7-9). Stage 9. MCE Science. Workbook - Unit 10: Transfer of Thermal Energy - Question 15

Paint one metal can black and the other white. Let the paint dry completely. Fill each can with an equal amount of water and place a thermometer in each can. Position both cans under the heat lamp at the same distance where they can receive equal amounts of light.



Why does heat transfer by radiation not require a medium?