Threshold frequency - Minimum energy required to release an electron from the surface of a metal with zero kinetic energy., Work function - Minimum energy of photon required to release an electron from the surface of a metal with zero kinetic energy., Irradiance - Power per unit area., Diffraction - When waves pass around a barrier or through an aperture., Phase - stage that a was (or point on a wave) has reached in its cycle., Coherent - Constant phase relationship., Constructive interference - When wave meet in phase (p.d. = m⋋), Destructive interference - When waves meet out of phase (p.d. = (m+0.5)⋋), Refraction - Change in speed and wavelength of light as it passes from one optical medium to another., Critical angle - Angle of incidence that corresponds to an angle of refraction of exactly 90o., Ground state - Lowest energy orbit that an electron can occupy (closest to nucleus in Bohr model)., Fraunhofer Lines - Dark absorption lines in solar spectrum due to obsorption of specific photons of light by the Sun's atmosphere., Emission (Bohr Model) - Electron makes transition to lower energy level releasing a photon with energy equal to the difference in energy between the two levels., Absorption (Bohr Model) - Electron excited to higher energy level when it absorbs a photon with energy exactly equal to the energy difference of the two levels., Photoelectric Emission - When electrons are ejected from the surface of a negatively charged metal in response to the incidence of photons with energy greater than the work function., Nuclear Fusion - Two nuclei of smaller mass number join to form a nucleus of larger mas number with the release of energy., Nuclear Fission - Nucleus of large mass number splits to form two daughter nuclei of lower mass number and releases energy., Binding energy - Energy required to completed dissociate the nucleons of a nucleus, Volt - p.d. between two point is 1V when 1J of energy is required to move 1C of charge between those two points., Force field - A region of space where a object experiences a force without being touched.,

Higher Physics Definitions Unit 2 P&W

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