Physics Definitions 3 0.0 / 5 ? PhysicsInternational BaccalaureateOther Created by: ADAMCreated on: 30-04-13 12:06 Nuclear Decay The random and sporadic process in which a nucleus decays, releasing either alpha, beta or gamma radiation. 1 of 11 Nuclides Nuclei with a specific number of protons and neutrons. 2 of 11 The law of radioactive decay The number of nuclei that will decay per second (i.e. the rate of decay) is proportional to the number of nuclei that haven't yet decayed. 3 of 11 rms value of a time-varying voltage The value of direct voltage that gives the same power output as the average ac power output. 4 of 11 emf The power supplied per unit current. 5 of 11 The Stefan-Boltzmann law for a black body Power emitted per unit area is proportional to [absolute temperature/temperature in K]^4 6 of 11 Acoustic impedence The product of the density of a medium and the speed of sound in the medium. 7 of 11 Critical Density The density at which the universe will stop expanding and start to contract. 8 of 11 Exposure Total charge of one sign produced by ioisation per unit mass of air. 9 of 11 Absorbed dose Energy absorbed by tissue. 10 of 11 Equivalent dose Absorbed dose taking into consideration the quality factor of the type of radiation. 11 of 11
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