Question

which mode of heat transfer takes place in the absence of a medium

Answer 1

Answer:

radiation

this process is only for gases and light that is why

Answer 2

Explanation:

These are by conduction, by convection and by radiation. The first two ways require material things as medium while the third way works even in the absence of material things. Radiation still works even though there is no material medium to transfer heat from its source to its destination.Hope it helps you