# G482 Definitions

Flashcards by aidenwh, updated more than 1 year ago
 Created by aidenwh about 8 years ago
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### Description

Physics Flashcards on G482 Definitions, created by aidenwh on 06/03/2013.

## Resource summary

 Question Answer Harmonics Stationary waves for a particular system with higher frequencies than the fundamental Conventional Current Direction is from positive to negative Kirchoff's 1st Law The sum of the current entering any point in a circuit is equal to the sum of the currents leaving that same point Kirchoff's 2nd Law The sum of the e.m.f.s round a loop in a circuit is equal to the sum of the p.d.s in that same loop Power The rate of energy transfer Reflection The bouncing back of a wave from a surface Refraction The change in direction of a wave as it crosses an interface between two materials where its speed changes Diffraction The spreading of a wave when it passes through a gap or past the edge of an object Wavelength of Radio Waves x10^1 Wavelength of Microwaves x10^-2 Wavelength of Infra-Red Radiation x10^-5 Wavelength of Visible Light 4x10^-7 to 7x10^-7 Wavelength of Ultra-Violet Radiation x10^-8 Wavelength of X-Rays x10^-11 Wavelength of Gamma Radiation x10^-11 Plane Polarised wave A transverse wave that oscillates in only one plane Constructive interference When two or more waves meet in phase; the amplitudes add Destructive interference When two or more waves meet in anti-phase; the amplitudes subtract Amplitude The maximum displacement of any point on a wave from its equilibrium position Wavelength The smallest distance from a point on a wave and a similar point on the next wave Period of a wave The time taken for one complete oscillation of a point on a wave Frequency The number of oscillations per unit time of any point Electron-volt 1 eV is the energy change of an electron when it moves through a potential difference of 1 volt Work Function The minimum energy required to release an electron from the surface of a metal Threshold Frequency The minimum frequency of electromagnetic radiation required to release an electron from the surface of a metal Mean Drift Velocity The average velocity of a charge carrier as it travels through a medium due to a potential difference Ohm's Law The current through a conductor is proportional to the potential difference across it at a constant temperature Displacement The distance any part of the wave has moved from its mean position Phase Difference Angular difference by which one wave or particle leads or lags behind another Speed of a wave The distance moved by the wave per unit time Coherant Waves with a constant phase difference (same frequency) Fundamental mode of vibration The lowest frequency stationary wave for a particular system Electric Current Net movement of charge Coulomb 1C is the charge transferred in 1 second by a current of 1 amp Potential Difference (P.D) The electrical energy transferred per unit charge when electrical energy is converted into another form of energy Electromotive Force (e.m.f) The energy transferred per unit charge when another type of energy is converted into electrical energy Volt 1V is 1 joule per coulomb Resistance Resistance is the potential difference per unit current Ohm 1 ohm is the resistance when 1 volt of potential difference produces 1 ampere of current Resistivity Resistivity = (Resistance x cross sectional area) / Length Kilowatt-hour 1 kWh is the energy transferred by a 1 kW device in a time of 1 hour Terminal p.d The potential difference across the total external resistance connected to an e.m.f. surface Progressive wave A wave that carries energy from one place to another Transverse wave A wave in which the direction of oscillation is perpendicular to the direction of travel of the wave Longitudinal wave A wave in which the particles oscillate parallel to the direction of travel of the wave Node A point on a stationary wave where the amplitude is zero Anti-node A point on a stationary wave where the amplitude is a maximum Principle of Superposition When two or more waves of the same type are in the same place at the same time, the resultant displacement is the sum of the displacements of the individual waves

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