acceleration - The rate of change of velocity, conservation of momentum - In the absence of external forces the total momentum of a system does not change, elastic collision - A collision where the total momentum and kinetic energy of a system does not change as a result of the collision, inelastic collision - A collision where momentum is conserved but kinetic energy is lost, Terminal velocity - The maximum speed of a falling object as a consequence of the weight downwards being balanced by the air resistance upwards, emf - The amount of energy given to each coulomb of charge as it passes through a battery or cell., work function - The amount of energy needed to be possessed by a photon in order to eject an electron from the surface of a metal, threshold frequency - The minimum frequency of light required for photoemission to occur, alternating current - Where current continually changes direction and instantaneous value with time, refractive index - The ratio of the speed of light in a vacuum to the speed of light in a material, critical angle - The angle of incidence which produces an angle of refraction of 900, redshift - The increase in the wavelength of light due to the light source moving away from the observer, wave particle duality - The phenomenon whereby light can behave as a particle or as a wave, dark energy - Proposed phenomenon resposible for the accelerated expansion of the Univers, dark matter - Proposed phenomenon responsible for the greater than expected orbital speeds around galaxies , irradiance - The power per unit area of radiation incident on a surface.,

Higher Physics Definitions

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