Which statement best describes longitudinal waves?
(The answer is c i guessed and got it right)

A.

Particles of the wave medium move perpendicular to the direction of propagation of the wave.

B.

Longitudinal waves do not require a material medium for propagation.

C.

Particles of the wave medium move parallel to the direction of propagation of the wave.

D.

Particles of the wave medium move long distances from the source of the wave to carry energy.

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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.