Question

In vacuum, heat is transferred by

• A. conduction
• B. convection
• C. radiation
• D. all the above three

Answer 1

Answer: (C)

radiation

In a vacuum, heat is transferred by radiation. In radiation, heat is transferred in the form of electromagnetic waves, which require no medium to propagate .

In conduction , heat is transferred from particle to particle , in vacuum there are no particles to transfer the heat , so conduction cannot transfer heat in vacuum .

In convection, heat is transferred by the actual movement of particles , but vacuum has no particles , so convection cannot work in vacuum .