Answer :
The primary mode of heat transfer in a vacuum is C) Radiation.
A vacuum is a space devoid of matter. This means there are no particles (like molecules or atoms) to facilitate heat transfer through conduction or convection.
Conduction: This is the process where heat is transferred through direct contact between particles. Since a vacuum has no particles, conduction cannot occur.
Convection: This method involves the movement of heat through a fluid (gas or liquid). Again, in a vacuum, there are no fluids to move heat around.
Radiation: This is the transfer of energy in the form of electromagnetic waves. It can travel through a vacuum. For example, the heat from the Sun reaches Earth through the vacuum of space by radiation.
