Q.If a hot body and a cold body are kept in vacuum, separated from each other, can they exchange heat? If yes, which mode of transfer of heat causes change in their temperatures? If not, give reasons.

Yes, they can. …

Yes, they can. Conduction and convection are impossible in vacuum (no material medium), but both bodies continuously emit and absorb thermal radiation — electromagnetic waves that cross the vacuum freely. The hot body radiates more than it absorbs and cools; the cold body absorbs more than it radiates and warms. The exchang …

Answer from the section this box belongs to (§3.10 of the Balbharati Std-XII Physics textbook) — recall the definiti …

Answering from memory of a different grade's phrasing — use this chapter's own definitions and keep th …