Question

which type of heat transfer causes a spoon to become warm when it is placed in a cup of hot water?

radiation
conduction
convection

Explanation:

Conduction is the transfer of heat through direct contact. When a spoon is placed in hot water, heat is transferred from the hot water molecules to the spoon molecules through direct contact between them. Radiation is the transfer of heat through electromagnetic waves and convection is the transfer of heat through the movement of fluids (like hot - air or hot - water currents). In this case, it's direct contact that causes the spoon to warm up.

Answer:

Conduction