Which of the following is true of electron-spin-resonance dating? a. It measures the breakdown of molecules in teeth to estimate their age. b. It uses a magnetic field to count the number of trapped electrons in apatite crystals. c. It is used to date zirconium crystals and has been used in South Africa where potassium-argon methods can’t be applied. d. It cannot be used on teeth.

stands for electromotive force and it is measured in volts. despite its name, it is not actually the force in the sense of being a "pushing" or "pulling" (not measured in newtons).an equation that relates emf,  ℰ,  to a battery's terminal voltage, v, current, i, and internal resistance, r, is    ℰ = v + irin this case, the emf can be interpreted as a voltage—a difference in electric potential.i would not say that it would be considered an energy. if emf can be defined as the energy/work per a unit charge from a battery or other electric source, then it is not strictly energy.