Question

what is the only type of heat transfer that can pass through a vacuum? convection radiation

Explanation:

Heat transfer occurs through three main mechanisms: conduction, convection, and radiation. Conduction requires direct contact between materials, convection involves the movement of fluids (liquids or gases), and radiation is the transfer of heat in the form of electromagnetic waves. A vacuum is a space devoid of matter (no particles of gas, liquid, or solid). Since conduction and convection rely on the presence of matter (either for direct contact or fluid movement), they cannot occur in a vacuum. Radiation, however, does not need a medium (matter) to travel. It can propagate through the vacuum of space, which is why we can receive heat from the Sun (a form of radiation - solar radiation) even though there is a vacuum between the Earth and the Sun.

Answer:

radiation