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Equipotentials are lines of constant potential. In radial fields they join points of equal potential and are perpendicular to the field lines.
They are concentric spherical surfaces about the centre ...

An oscillation is damped if resistive forces are present e.g. air resistance or friction.
The amplitude of the system will decrease over time, as opposed to a free oscillation which is undamped (no r...

The moment of a force about any point is defined as the force x perpendicular distance from the line of action of the force to the point - moment = F x d the unit is Nm.
Principle of moments states t...

Scalars have a magnitude (size) only. Vectors have both magnitude and direction.

The photoelectric effect is the emission of electrons from the surface of a metal due to exposure of electromagnetic radiation above a certain frequency.
Photon energy (E=hf or E=hc/λ).
The work...