E,W&P 1 Flashcards
ABSORPTION SPECTRUM
spectrum of dark lines across the pattern of spectral colours produced when light passes through a gas & the gas absorbs certain frequencies
AMMETER
device used to measure electric current, connected in series
AMPERE (A)
SI unit for electric current
AMPLITUDE
maximum displacement of a wave from its rest position (m)
ANTINODE
point of maximum amplitude along a stationary wave caused by constructive interference
AREA (A)
physical quantity representing the size of part of a surface (m2)
CELSIUS
unit for temperature (not the SI)
COHERENCE
2 waves with a constant phase relationship
CONDUCTOR
material with a high number density of conduction electrons & low resistance
CONSERVATION OF CHARGE
physical law stating charge is conserved in all interactions, can’t be created or destroyed
CONSERVATION OF ENERGY
physical law stating energy can only be transformed from one form to another, can’t be created or destroyed
CONVENTIONAL CURRENT
model used to describe the movement of charge in a circuit ( + to - )
DIFFRACTION
when a wave spreads out after passing around an obstacle or through a gap
DYNAMO
device that converts kinetic energy to electrical energy
ELECTRIC CHARGE
Q = IT (C - scalar)
ELECTROLYTE
fluid that contains ions that are free to move and hence conduct electricity
EM WAVE
self-propagating transverse wave that does not require a medium to travel through
E.M.F
electrical energy transferred per unit charge when one form is converted into electrical energy (V)
ELECTRON
-vly charged cub-atomic particle
ELECTRON DIFFRACTION
process of diffracting an electron through a gap - ex. of wave-particle duality
ELECTRON FLOW
opposite to conventional current ( - to + )
ELECTRONVOLT
one electronvolt is the energy charge of an electron when it moves through a potential different of 1V (1.6 x10-19)
EMISSION SPECTRUM
pattern of colours of light, each colour has a specific wavelengh
ENERGY LEVELS
one of the specific energies an electron can have when in an atom
