Review29 - Modified from College Physics, 8th Ed., Serway...

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Modified from College Physics , 8 th Ed., Serway and Vuille. For the quizzes and tests, you should know all the concepts and equations in this summary. Section 29.3: Radioactivity The spontaneous emission of radiation by certain nuclei is called radioactivity . There are three processes by which a radioactive substance can decay: alpha ( α ) decay, in which the emitted particles are nuclei; beta ( β ) decay, in which the emitted particles are electrons or positrons; and gamma ( γ ) decay, in which the emitted particles are high-energy photons. He 4 2 The decay rate , or activity , R , of a sample is given by N t N R λ = Δ Δ = [29.3] where N is the number of radioactive nuclei at some instant and λ is a constant for a given substance called the decay constant . Nuclei in a radioactive substance decay in such a way that the number of nuclei present varies with time according to the expression t e N N = 0 [29.4a] where N is the number of radioactive nuclei present at time t , N
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Review29 - Modified from College Physics, 8th Ed., Serway...

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