Question

which type of energy transfer was responsible for warming the sand and water in the lab?
a. conduction
b. convection
c. radiation
d. evaporation

Explanation:

Conduction is energy transfer through direct contact. Convection involves fluid - motion. Evaporation is a phase - change process. Radiation is energy transfer via electromagnetic waves. In a lab setting, if there is no direct contact heating or fluid - driven heating mechanism, and assuming the sand and water are warmed by a heat source like a lamp, it is likely due to radiation.

Answer:

C. Radiation