Definitions physics 4.0 / 5 based on 1 rating ? PhysicsASAQA Created by: ShireeCreated on: 07-01-13 22:18 Specific charge The ratio of a particles charge to its mass. 1 of 18 Electron volt Unit of energy energy equivalent to 1.6x10^-19J. 2 of 18 Ground state When electrons are in their lowest energy state. 3 of 18 Ionisation energy The energy required to completely remove an electron from an atom. 4 of 18 Photoelectricity The emission of electrons from a metal surface when it is illuminated with electromagnetic light. 5 of 18 Work function The minimum energy needed by an electron to escape from the surface of a metal. 6 of 18 Threshold frequency The minimum frequency of photons for emission of electrons. 7 of 18 Wave particle duality Having wave like properties and particle like properties. 8 of 18 Isotopes Isotopes are the same element with the same number of protons but a different number of neutrons. 9 of 18 Hadrons Particles that experience the strong nuclear force. 10 of 18 Baryons Particles comprised of three quarks. 11 of 18 Mesons Particles comprised of a quark and an antiquark. 12 of 18 Electrical current The rate of flow of electric charge. 13 of 18 Potential difference Work done per unit charge between two points. 14 of 18 Ohm's law The current flowing through a metal wire at a constant temperature is proportional to the p.d. across it. 15 of 18 EMF Work done by the battery per unit charge OR The p.d. across the terminals when no current is flowing. 16 of 18 Internal resistance The resistance of the materials within the battery. 17 of 18 Superconductor A material that has zero resistivity. 18 of 18
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